2005 tiffin motorhomes allegro bus 40qdp 2005 tiffin allegro bus 40qdp 40' 4" class a motorhome. cummins 8.9l 400hp diesel engine. 4 slide outs 2 awnings sleeps 4 dual a/c units leveling system. imagine driving off to all of your favorite destinations in this tiffin allegro bus class a coach. model 40qdp 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....