Gerald,
Welcome to the funky TC band. Your's is a problem that has been successfully 'worried through' by many on here. Remember, Form Follows Function.
I have personally gone through many of the steps to keep the TC out of the elements with these observations:
1. Plastic tarps are not good. They tend to disintegrate in th UV, last only one season, and leave perminent marks on your camper's epidermis.
2. Heavy cotton duck tarp. A real tarp. This worked pretty well for us, except: it was very heavy. After a few seasons, if not well protected off-season, would deteriorate. It was also hard on the top vents, cracking one with the 4' of snow load.
3. Using nothing is not bad too, if you absolutely have no leaks and have an aluminum roof and do yearly updates on the weather proofing.

I know it's a dog's dinner, but various H.D. stands and jax with 4x4's worked fine under the edges of the floor:

4. The best so far is our dedicated RV/tractor shed.

The TC and the tractor bucket fit together like a lego:

5. If you have only one place to store your TC, then pour a slab (4" min) wider than the jacks and a couple feet longer than you TC and lower the weight on saw horses.
regards, as always, jefe