Interior of Allegro Bus 45LP by Tiffin

Interior of Allegro Bus 45LP by Tiffin

Editor’s Note: The following article, authored by Mark Quasius for the December 2014 issue of Family Motor Coaching magazine, offers an inside look at the Allegro Bus 45LP by Tiffin Motorhomes Inc. The magazine is published by Cincinnati-based Family Motor Coach Association (FMCA). For the full story click here.

The Allegro Bus is one of Tiffin Motorhomes’ crowning achievements. Designed for use in a full-time environment, it’s been well accepted by both full-time and part-time motorhome travelers. The 2015 Allegro Bus is available in three floor plans; the most popular is the 45LP, which was unveiled in 2014. For the 2015 model year, the 45LP breaks new ground with additional features and upgrades.

Having owned a 2007 Allegro Bus for eight years, I was particularly interested to see how this model has evolved. I anticipated the usual changes, but the Allegro Bus exceeded my expectations.

The 45LP is a bath-and-a-half floor plan featuring a rear walk-in wardrobe. Often the bath-and-a-half layout detracts from midcoach space, and a walk-in wardrobe takes away even more. But Tiffin designers did an excellent job of making everything fit. I found this to be one of the most livable floor plans I’ve ever encountered.

Storage is always a consideration, but Tiffin officials claim to incorporate the most storage of any motorhome manufacturer. I found cabinets, drawers, and pockets everywhere I looked, and they were of substantial size and quite useable.


The Allegro Bus is built with vacuum-laminated sidewalls and a gel-coat fiberglass exterior. Thermal insulation and a tubular aluminum skeleton make up the wall’s interior, while a thermal-wrap moisture barrier separates the interior wall panel from the aluminum skeleton.

The porcelain tile floor is bonded to oriented strand board and incorporates an epoxy-based grout designed to handle flexing. The floor is placed over a steel subframe that is welded to the chassis frame rails.

The roof consists of one-piece formed fiberglass bonded to plywood. The air-conditioner drain lines are plumbed through the 5 1/2-inch foam insulation to duct the condensation to the rear cap, which prevents water from dripping down the sidewalls. The air-conditioners utilize ceiling ducts that run the full length of the motorhome.


The Allegro Bus is built on Tiffin’s patented PowerGlide chassis. Design features include a 326-inch wheelbase, a tag axle, a side radiator, ZF independent front suspension, and a 60-degree wheel cut. An 8.9-liter Cummins ISL9 diesel engine, rated at 450 horsepower and 1,250 pound-feet torque, is coupled with an Allison 3000 MH Series 6-speed automatic transmission. A 150-gallon fuel tank and a 15-gallon DEF tank are standard.

Filling large fuel tanks can be tricky, because the filler hoses generally are level with the top of the tank; air becomes trapped, which shuts off the refueling nozzle and results in backsplash. To combat this, the Allegro Bus incorporates a driver’s-side raised fuel fill, which allows the fuel to flow down into the tank instead of horizontally across the top.

The 45LP is outfitted with HWH hydraulic leveling jacks. It also can be equipped with a Valid automatic air-leveling system, which allows the air-ride suspension to level the coach without using the jacks — beneficial when parked on soft ground or asphalt. A single control panel operates whichever leveling system you choose. It also engages the Active Ride system, which further levels the motorhome while driving and provides additional stability.

For the full story click here.