Pulling small trailer

I have a r pod 172 that I pull with a Chrysler Aspen.  I also have a 3 wheel trike that I ride for exercise, which is long, wide and bulky. My problem is:  When we go camping, I have no where for storage for my trike, so it stays at home.  Would love to take my trike with me.  Is it legal, safe, or not very wise to pull a small trailer behind the pod with my trike on it.  I would try and find a very small trailer that would just fit my trike.  I thought about removing the spare tire and take it in the back of the Aspen, but I am afraid that my receiver hitch on the back of the pod may fail, or, worse, it could damage the channel iron support under the pod.  Any advice would be appreciated.

The states that allow double towing, state that the "1st" tow, must be a 5th wheel. 

The other factor is the hitch on the back of the R-Pod is not sturdy enough to support that type of load. It is meant for a load of up to 150 lbs, and that close in to the body of the trailer. The dynamic loads of a second trailer would likely exceed the capacity of the hitch and would also void your frame warranty. Your fears are justified. In short: Don't do it!

I think it is a bad idea. Even with padding, you are putting stress on the fiberglass roof which is not meant to take that kind of stress. Transferring some weight that way does not change that you are talking about grossly overloading the rear hitch for a purpose for which it was not designed. It will void your warranty if you have one. It may also get you or someone else hurt should the welds on the small cross-member that support the hitch and the default spare tire break, dumping your trike.

The force on the hitch when you carry things that it was not designed to carry are magnified by the fulcrum effect.  If you were to attach your straps to the aluminum wall frames instead of open space on the roof, you may be able to counter that additional force, but the risk is that you will develop leaks as the attachment screws move from the irregular force applied.