have only see 2 to haulers like your looking for. both were factory ordered to haul c-j size jeeps.
they are out there but, have an idea, might be hare to find. used any way.
both had been modified at factory with tail gates and better floors and made to haul extra weight.
both were weekend warriors.
one fellow had to put smaller tires on to load, but the stock jeep would drive right in.
the out fits were from California. i saw them a few years back during hunting season. they had stopped for gas and were nice enough to show me there trailers,as i was looking for a toy hauler at the time.