CamperHardlyKnowHer

KZ Sportster 321THR13

Travel trailerbuilt 2018–20Mixed build tierFindable on the used market
WHAT ONE COSTS
—price not published

The maker never published an MSRP for this floorplan. Unknown is not cheap — treat any asking price against comparable models, not against zero.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~9,496 lbestimated as towed, for 2 people

dry weight 8,070 lb + fresh water (75 gal, full) 626 lb + propane + battery 200 lb + gear for 2 600 lb. Brochure dry weight omits water, propane, batteries and your gear; this estimate doesn't.

You want a tow rating around10,555 lb (10% margin)
GVWR (the sticker maximum)10,000 lb
Tongue weight, loaded~1,365 lb (14%)
Cargo capacity1,930 lb
WHICH TOW VEHICLES IT FITS — 34 OF 95

Judged the way the app judges: estimated loaded weight against each vehicle's rating less a 10% margin — per model year, because the 321THR13's published weights changed mid-run.

VEHICLETOW RATINGVERDICT
Chevrolet Silverado / GMC Sierra 1500 (6.2 V8, max tow) '19-2613,300 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax, max tow) '24-2622,500 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '20-2318,510 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '11-1918,100 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '20-2636,000 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '11-1923,300 lbfits, loaded, with 10% margin
Chevrolet Silverado 1500 (max tow) '14-1812,500 lbfits, loaded, with 10% margin
Chevrolet Silverado EV (4WT) '24-2612,500 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '24-2613,500 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '11-1411,300 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '15-2013,200 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '21-2314,000 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, gooseneck) '20-2222,800 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, tow pkg) '17-1918,000 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel) '11-1616,600 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 HO diesel, gooseneck) '23-2623,000 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '20-2237,000 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '17-1932,500 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '11-1621,600 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 HO diesel DRW, gooseneck) '23-2638,000 lbfits, loaded, with 10% margin
Ford F-450 Super Duty (6.7 HO diesel DRW, gooseneck) '23-2640,000 lbfits, loaded, with 10% margin
GMC Sierra EV '24-2612,000 lbfits, loaded, with 10% margin
Nissan Titan XD (Cummins diesel) '16-1912,710 lbfits, loaded, with 10% margin
Ram 1500 (3.0 Hurricane, max tow) '25-2611,610 lbfits, loaded, with 10% margin
Ram 1500 (5.7 Hemi eTorque, max tow) '19-2412,750 lbfits, loaded, with 10% margin
Ram 1500 (5.7 Hemi, max tow) '11-1810,620 lbfits, loaded, with 10% margin
Ram 2500 (6.7 Cummins HO) '19-2620,000 lbfits, loaded, with 10% margin
Ram 2500 (6.7 Cummins) '11-1817,980 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins DRW, gooseneck) '13-1831,210 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '25-2636,610 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '19-2437,090 lbfits, loaded, with 10% margin
Rivian R1T '22-2611,000 lbfits, loaded, with 10% margin
Tesla Cybertruck '24-2611,000 lbfits, loaded, with 10% margin
Toyota Tundra (i-Force Max, tow pkg) '22-2612,000 lbfits, loaded, with 10% margin
The 61it doesn't fit
  • Chevrolet Colorado / GMC Canyon (2.7 Turbo HO, tow pkg) '23-26 — over by ~2,566 lb loaded
  • Chevrolet Colorado / GMC Canyon (2.8 Duramax) '15-22 — over by ~2,566 lb loaded
  • Chevrolet Suburban (5.3 V8, max tow) '21-26 — over by ~2,026 lb loaded
  • Chevrolet Tahoe (5.3 V8, max tow) '21-26 — over by ~1,936 lb loaded
  • Chevrolet Traverse (tow pkg) '18-26 — over by ~4,996 lb loaded
  • Chrysler Pacifica '17-26 — over by ~6,256 lb loaded
  • Dodge Durango (5.7 / 6.4 Hemi, tow pkg) '14-26 — over by ~1,666 lb loaded
  • Ford Bronco 4-dr (2.7 EcoBoost, tow pkg) '21-26 — over by ~5,446 lb loaded
  • Ford Expedition (3.5 EcoBoost, tow pkg) '18-24 — over by ~1,126 lb loaded
  • Ford Expedition (3.5 EcoBoost, tow pkg) '25-26 — over by ~856 lb loaded
  • Ford Explorer (3.0 EcoBoost, tow pkg) '20-26 — over by ~4,456 lb loaded
  • Ford F-150 Lightning (max trailer tow) '22-26 — over by ~496 lb loaded
  • Ford Maverick (2.0 EcoBoost, 4K tow pkg) '22-26 — over by ~5,896 lb loaded
  • Ford Ranger (2.3 EcoBoost, tow pkg) '19-23 — over by ~2,746 lb loaded
  • Ford Ranger (2.7 EcoBoost, tow pkg) '24-26 — over by ~2,746 lb loaded
  • Ford Transit (HD tow pkg) '15-26 — over by ~3,286 lb loaded
  • GMC Acadia (tow pkg) '20-26 — over by ~4,996 lb loaded
  • GMC Hummer EV Pickup '22-26 — over by ~2,746 lb loaded
  • GMC Yukon / Yukon XL (5.3 V8, max tow) '21-26 — over by ~1,936 lb loaded
  • Honda Odyssey '18-26 — over by ~6,346 lb loaded
  • Honda Passport (AWD) '19-26 — over by ~4,996 lb loaded
  • Honda Pilot (AWD, tow pkg) '16-26 — over by ~4,996 lb loaded
  • Honda Ridgeline (AWD) '17-26 — over by ~4,996 lb loaded
  • Hyundai Palisade (tow pkg) '20-26 — over by ~4,996 lb loaded
  • Hyundai Santa Cruz (2.5T AWD) '22-26 — over by ~4,996 lb loaded
  • Jeep Gladiator (3.6 V6, max tow) '20-26 — over by ~2,566 lb loaded
  • Jeep Grand Cherokee (5.7 Hemi) '11-21 — over by ~3,016 lb loaded
  • Jeep Grand Cherokee (WL, tow pkg) '22-26 — over by ~3,916 lb loaded
  • Jeep Grand Cherokee L (5.7 Hemi) '21-26 — over by ~3,016 lb loaded
  • Jeep Grand Wagoneer (Hurricane, max tow) '22-26 — over by ~631 lb loaded
  • Jeep Wagoneer (Hurricane, max tow) '22-26 — over by ~496 lb loaded
  • Jeep Wrangler Unlimited 4-dr (tow pkg) '18-26 — over by ~6,346 lb loaded
  • Kia Telluride (tow pkg) '20-26 — over by ~4,546 lb loaded
  • Land Rover Defender '20-26 — over by ~2,116 lb loaded
  • Land Rover Discovery '17-26 — over by ~2,116 lb loaded
  • Lexus GX 550 (tow pkg) '24-26 — over by ~1,311 lb loaded
  • Lexus LX 600 '22-26 — over by ~2,296 lb loaded
  • Mazda CX-90 (3.3 turbo, tow pkg) '24-26 — over by ~4,996 lb loaded
  • Mercedes-Benz Sprinter '19-26 — over by ~2,746 lb loaded
  • Nissan Armada (3.5 twin-turbo, tow pkg) '25-26 — over by ~1,846 lb loaded
  • Nissan Armada (tow pkg) '17-24 — over by ~1,846 lb loaded
  • Nissan Frontier (3.8 V6, tow pkg) '22-26 — over by ~3,061 lb loaded
  • Nissan Pathfinder (tow pkg) '22-26 — over by ~4,096 lb loaded
  • Nissan Titan (5.6 V8, tow pkg) '17-24 — over by ~711 lb loaded
  • Ram ProMaster '14-26 — over by ~3,276 lb loaded
  • Rivian R1S '22-26 — over by ~2,566 lb loaded
  • Subaru Ascent '19-26 — over by ~4,996 lb loaded
  • Subaru Outback (XT / Wilderness) '20-26 — over by ~6,346 lb loaded
  • Tesla Model X (tow pkg) '16-26 — over by ~4,996 lb loaded
  • Tesla Model Y (tow pkg) '21-26 — over by ~6,346 lb loaded
  • Toyota 4Runner (4.0 V6) '11-24 — over by ~4,996 lb loaded
  • Toyota 4Runner (i-Force Max) '25-26 — over by ~4,096 lb loaded
  • Toyota Grand Highlander (i-Force Max) '24-26 — over by ~4,996 lb loaded
  • Toyota Highlander (tow pkg) '20-26 — over by ~4,996 lb loaded
  • Toyota Land Cruiser (i-Force Max) '24-26 — over by ~4,096 lb loaded
  • Toyota Sequoia (i-Force Max, tow pkg) '23-26 — over by ~926 lb loaded
  • Toyota Sienna '21-26 — over by ~6,346 lb loaded
  • Toyota Tacoma (i-Force Max, tow pkg) '24-26 — over by ~3,646 lb loaded
  • Toyota Tacoma (V6, tow pkg) '16-23 — over by ~3,376 lb loaded
  • Toyota Tundra (5.7 V8, tow pkg) '11-21 — over by ~316 lb loaded
  • Volkswagen Atlas (tow pkg) '18-26 — over by ~4,996 lb loaded
THE SPECS
Length37.3 ft
Height (incl. A/C)12.3 ft
Width8.5 ft
Interior height7.5 ft
GVWR10,000 lb
Dry weight8,070 lb
Dry tongue weight1,160 lb
Cargo capacity1,930 lb
Sleeps7
Slide-outs1
Axles2
Fresh water75 gal
Grey water32 gal
Black water32 gal
Air conditioning13,500 BTU
Awning19 ft

A missing row means the maker never published that figure — unknown, not zero.

WHERE PEOPLE SLEEP
  • 1× Front king bed(Permanent)—
  • 1× Optional 60×84 power bed with Sit-and-Sleep in the garage(Stow-away)—
  • 1× 80" U-dinette in the slide(Convertible)—
HOW IT'S BUILT — 4/5
WallsLaminated fiberglass
FrameAluminum
RoofWalk-on
UnderbellyEnclosed

KZ (Mixed tier): KZ's toy hauler line (Thor Industries), sold as Sportsmen Sportster through 2016, Sportster/Sportster 100 from 2017, and Sportster X since 2025. Construction is mid-pack for the segment — aluminum-framed laminated fiberglass walls, a 3/8" walk-on roof and a heated, enclosed underbelly — with a Tuff Ply garage floor and diamond-plate wall protection that hold up well. KZ's assembly quality is uneven unit to unit, which is why it lands in the middle rather than at the top.

YEAR BY YEAR — WHAT CHANGED
YEARSGVWRDRYMSRP
2018–1910,000 lb7,880 lb—
202010,000 lb8,070 lb—
  • 2018Introduced, replacing the 321THR12
  • 2020Length 37'1" to 37'3"; UVW 7,880 to 8,070 lb
  • 2021Dropped
FINDING ONE

Findable — a few listed nationwide most weeks. Why: KZ is a volume manufacturer. Estimated from build volume and production span — not a count of live listings.

THE READ

13-foot garage in a 102"-wide body; the 10,000 lb GVWR leaves under 2,000 lb once the trailer is loaded.

OTHER SPORTSTER FLOORPLANS
18TH · 7,000 lb · sleeps 4190TH · 7,000 lb · sleeps 4210TH · 7,000 lb · sleeps 6211THD · 7,940 lb · sleeps 6220THR · 7,000 lb · sleeps 6229TH · 7,000 lb · sleeps 422X · 12,000 lb · sleeps 626X · 12,750 lb · sleeps 6270TH · 8,800 lb · sleeps 6270THR · 10,000 lb · sleeps 4280THR · 8,800 lb · sleeps 6290THR · 10,000 lb · sleeps 8300THR · 10,000 lb · sleeps 6301THR · 11,000 lb · sleeps 8the whole line →
Is the 321THR13 your #1 — or just a spec sheet?

These are the facts. Whether it beats the other six thousand rigs for you depends on what you care about — set your priorities as sliders and watch the whole market re-rank around them. Nothing gets hidden, everything gets explained.

Rank it against your setup →

Data compiled from manufacturer spec sheets, retrieved 2026-07.