If it were me I would get a DP and tow a 24' cargo or 35" sport trailer with a van or truck inside. That way you can have all your goods inside the van / truck and if there is parking onsite at the venue for vendors (often there is) then you can just leave everything connected. If you need to park at a nearby RV park you can tow the trailer with the van / truck / SUV after you get to the RV park. You will need a large trailer and a fairly powerful DP to tow it with. Alternatively you can get a "Super C" such as a Thor 35xx built on a Ford F550 or Freightliner M2-106 chassis. These rigs have a tremendous tow capacity and comfortable sleeping arrangements.
