In Toters & Conversion Truck Coaches - there are lots of configuration options and just about any motor mfg can be found cat/cummins/detroit/benz/peterbuilt and anywhere from a small 8 L to 16 or 18 L depending on the chassis (M2 all the way to cascadia and volvo's, KW's, PB, etc)
the autotrans are amazing transmissions (dry clutch w/ not clutch pedal) 12 or 13 speeds that skip shift as needed....million mile chassis, engines & trans.
and all of these trucks are "common" parts with lower (than pusher) labor rates due to access and common OTR truck parts.
most are built for pulling loads that we'll never see & set up for trackside (dry) camping - 200+ gallons of water w/ generators from 6kw to 12kw
its a buyers market (still).
