I'd think that unloading a gravity fed pit into a toyhauler would take alot of effort. The toyhaulers that I see around here are pretty high off the ground with a reasonably steep ramp. I use a winch to put mine into a cargo trailer but it can be done with two people. Maybe cook on the ramp door so it doesn't have to be unloaded at camp?
Lang 84D, Large Charcoal Dropper, WSM-18, Weber OTS