Is 360 hp enough for for 38-40 ft class A

All good answers up to this point, one thing, there is no sub. for cu. inches, period, when it comes to torque. that said, find a 13, 14, 15, 16 liter engine in a MH with 1250 torque or better, and the proper gears, putting all that torque to the ground?? You will sail up the hills! Not many hills that will test a MH around Peoria, I-474 east from the river should give you a idea? I trucked all over the country with a N-14, 460 hp., 1650 ft. lbs. torque, pulling up to 80,000 lbs. gross. never had a problem in the mountains? And in all those years, most of the MH's did just fine pulling the hill's, and the ones with the big truck motors, sailed up the mountains! But the more hp. and the harder you press it, the more fuel you will burn, and you have to keep an eye on the transmission gauge, Too! It is the weak link, and you do not want to cook it,, for sure!! Do not worry, if you find a diesel MH with the torque up in the 1000 or more, you will do fine, just know the weight of the coach and get the torque that is up there for the weight!
Have fun!