I'd pull the doghouse to get a better view. There really shouldn't be any hoses toward the back of the engine as most motorhomes have to run the hoses forward to the heater unlike cars where the hoses run to the firewall. You probably don't want to hear this but coolant leaks around the tranny can be a leaking freeze plug behind the flywheel/flexplate requiring transmission removal to replace. This generally only happens on vehicles that the coolant hasn't been changed on time or that were filled with just water.