My first car was a 77 Lincoln with v-belts 460 cid with a c6 trans. So that's the only thing I can pull from to help out. Both drivers side loops will go over the water pump/ fan pulley, from there they go differently. One goes up and over the power steering pulley and then back down to the crank. The other goes to the a/c and then down to the crank. Now you might also have a 3rd belt that goes only from the crank to the passenger side down low, this would be for the alternator. Now mine also had a 4th for the air pump and that was driven off of the water pump only.
I hope this helps, I know it's not on a motorhome. But the engine might match.
99 DSDP 3865 Cat 300, 06 Acura TL via dolly