Joe and Bill,
Great idea guys. It was discussed here about a year ago: Possible to convert Scamp 5th wheel...
I was set to buy the materials to build a lighter-weight setup than this specifically for a Scamp
last year. After I had it all figured out on paper, and had gone to order the materials, I checked the Iowa vehicle law. Here's what it says...
four wheeled trailers
321.310 Towing four -wheeled trailers .
1. A motor vehicle shall not tow a four-wheeled trailer with a steering axle, or more than one trailer or semitrailer, or both in combination. However, this section does not apply to a motor home, multipurpose vehicle, motor truck, truck tractor or road tractor nor to a farm tractor towing a four -wheeled trailer , nor to a farm tractor or motor vehicle towing implements of husbandry, nor to a wagon box trailer used by a farmer in transporting produce, farm products or supplies hauled to and from market.
2. Any four -wheeled trailer towed by a truck tractor or road tractor shall be registered under the semitrailer provisions of section 321.122 , provided, however, that the provisions of this section shall not be applicable to motor vehicles drawing wagon box trailers used by a farmer in transporting produce, farm products or supplies hauled to and from market.
A dolly of this type effectively turns your fifth wheel into a four-wheeled trailer that is illegal to operate, at least where I live. If it's illegal here, it may be in other states as well.