Receiver Extension for Camper

I just bought a small camper to use in my Ford F-250 tow vehicle, and now I need a solution for extending out the receiver hitch so I can haul the race car trailer behind. It seems like there are a lot of products on the market that provide 18" extension on a 2" receiver, but I seem to need a little more, about 21". Torklift has a product called their "Supertruss" extension, which has options up to 48", but seems to require their own, receiver (Superhitch), which is added expense I would hope to avoid.



Any advice from the group on which products I should be looking, and how I can tackle this problem, would be most appreciated?



Thanks



Nathan