2009 tiffin motorhomes allegro bus 40qsp 2009 tiffin allegro bus 40qsp 40' class a motorhome. cummins 425hp diesel engine 4 slide outs with toppers awning sleeps 5 dual a/c units auto leveling. imagine driving off to all of your favorite destinations in this tiffin allegro bus class a coach. model 40qsp offers quadruple slide outs for extra interior space plus so much more! step inside and take a look back at all of the convenient features that would make any journey enjoyable. the kitchen area features everything you need to prepare great meals on the go including a sink a three....