CamperHardlyKnowHer

Tiffin Allegro Bus 40 SP

Class Abuilt 2015–18Better build tierPatient search 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.

THE SPECS
Length40.9 ft
Height (incl. A/C)12.6 ft
Width8.4 ft
Interior height7.0 ft
GVWR40,000 lb
Dry weightnot published
Sleeps4
Fresh water90 gal
Grey water70 gal
Black water50 gal
Air conditioning30,000 BTU
Fuel150 gal
Engine / chassisCummins ISL 450 HP diesel, Allison 3000 MH 6-speed, PowerGlide raised rail
Generator10.0-kW Onan Quiet Diesel

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

WHERE PEOPLE SLEEP
  • Rear king bed(Permanent)72×80
  • Sofa bed(Convertible)
  • Booth dinette/sleeper(Convertible)
HOW IT'S BUILT — 4/5
WallsLaminated fiberglass
FrameAluminum
RoofWalk-on
UnderbellyEnclosed

Tiffin (Better tier): Tiffin Motorhomes

YEAR BY YEAR — WHAT CHANGED
YEARSGVWRDRYMSRP
201537,600 lb
2016–1840,000 lb
  • 2015Introduced at 41 ft 1 in
  • 2016GVWR raised to 40,000 lb
  • 2018Final model year
FINDING ONE

Patient search — weeks of watching, and probably some travel. Estimated from build volume and production span — not a count of live listings.

THE READ

Mid-length plan of the ISL era; replaced by the 40 IP when Tiffin reworked the 41-foot layouts.

OTHER ALLEGRO BUS FLOORPLANS
Is the 40 SP 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 dealer and aggregator listings, retrieved 2026-07.