Rigs / Monaco / Diplomat / 43P Monaco Diplomat 43P Class A built 2017–17 Mixed build tier Scarce on the used market
WHAT ONE COSTS
$240,200 est. used (2017, 9 yr old)
Sticker was $419,852 in 2017 — out of production since 2017, so the used market is the only way to buy one. Estimate assumes a 2017 unit.
THE SPECS
Length 43.8 ft
Height (incl. A/C) 12.9 ft
Width 8.5 ft
Interior height 7.0 ft
GVWR 44,600 lb
Dry weight not published
Sleeps 6
Slide-outs 4
Fresh water 100 gal
Grey water 60 gal
Black water 40 gal
Fuel 150 gal
Engine / chassis Cummins ISL 450 hp / Roadmaster tag-axle chassis, Allison 6-speed
Generator Onan 8.0 kW Quiet Diesel
A missing row means the maker never published that figure — unknown, not zero.
WHERE PEOPLE SLEEP
1× Master king bed(Permanent) — 2× Convertible sofa beds(Convertible) — HOW IT'S BUILT — 4/5
Walls Laminated fiberglass
Frame Aluminum
Roof Walk-on
Underbelly Enclosed
Monaco (Mixed tier): Monaco Coach Corp (2005-2009), Navistar RV (2010-2013), REV Recreation Group (2014-2017)
YEAR BY YEAR — WHAT CHANGED
2017 Introduced 2017 Last model year FINDING ONE
Scarce — months of watching; be ready to fly and drive it home. Why: only one model year. Estimated from build volume and production span — not a count of live listings.
THE READ
Most expensive Diplomat ever listed; quad slide, final model year.
OTHER DIPLOMAT FLOORPLANS
36SKT · 33,000 lb · sleeps 4 38PDD · 33,000 lb · sleeps 4 38PDQ · 33,000 lb · sleeps 6 40DST · 33,000 lb · sleeps 4 40PAQ · 33,000 lb · sleeps 4 40PDQ · 36,000 lb · sleeps 8 40PRQ · 33,000 lb · sleeps 6 41PDQ · 36,000 lb · sleeps 8 41SKQ · 36,000 lb · sleeps 8 43D · 44,600 lb · sleeps 6 43DF · 44,600 lb · sleeps 8 43DFT · 43,000 lb · sleeps 8 43G · 44,600 lb · sleeps 6 43PDQ · 43,000 lb · sleeps 8 the whole line → Is the 43P 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.