Keep in mind, the king pin portion of both RV and semi trailers are pretty much the same size, although probably different material and capacities, but the bearing surface of the two are very different, the smaller diameter RV hitch is designed to support a pin weight of 3 or 4 thousand pounds, while the semi plates are designed to carry 50 thousand pounds or more. Rule of thumb is you can pull a RV with a semi style hitch, but not the other way around. RV hitches usually will tilt slightly left or right where semi hitches do not. If your state does not allow the big 5th wheel, you may have to look at finding a lighter trailer designed for RV hitch, perhaps something used for trade shows or light freight. would still be a stronger trailer than a manufactured RV, and still be a blank canvas for your designs.
Dave
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