Tiffin Allegro Bus 40 SP

Name: Tiffin Allegro Bus 40 SP
Brand: Tiffin

Class Abuilt 2015–18Better build tierScarce on the used market

WHAT ONE COSTS

$245,700est. used (2018, 8 yr old)

Sticker was $429,911 in 2018. Out of production since 2018, so the used market is the only way to buy one. Estimate assumes a 2018 unit.

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

1× Rear king bed(Permanent)72×80
1× Sofa bed(Convertible)—
1× 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

YEARS	GVWR	DRY	MSRP
2015	37,600 lb	—	$429,911
2016–18	40,000 lb	—	$429,911

2015Introduced at 41 ft 1 in
2016GVWR raised to 40,000 lb
2018Final model year

FINDING ONE

Scarce: months of watching; be ready to fly and drive it home. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

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

OTHER ALLEGRO BUS FLOORPLANS

35 CP · 41,000 lb · sleeps 3 36 AP · 42,000 lb · sleeps 3 36 QSP · 36,600 lb · sleeps 4 37 AP · 41,000 lb · sleeps 4 40 AP · 41,000 lb · sleeps 4 40 IP · 42,000 lb · sleeps 4 40 QBP · 37,600 lb · sleeps 4 40 QXP · 44,600 lb · sleeps 4 43 QBP · 54,500 lb · sleeps 4 43 QGP · 50,900 lb · sleeps 4 43 QRP · 54,600 lb · sleeps 4 45 BP · 52,000 lb · sleeps 8 45 FP · 52,000 lb · sleeps 5 45 LP · 51,300 lb · sleeps 4 the whole line →

Find one for sale

Live listings for the 40 SP on the big marketplaces. Each search opens pre-filled with this exact floorplan:

RV Trader ↗Camping World ↗FB Marketplace ↗Google ↗

Inventory varies by site and day. Slim pickings? search the whole Allegro Bus line ↗

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, switch on your hard limits, and watch the whole market re-rank around them. Every exclusion explained, every margin shown.

See where it ranks for you →

Data compiled from dealer and aggregator listings, retrieved 2026-07.