When I was working on my underbelly, I made a small "lift" that was basically a stack of two 2x12 pieces of wood, with enough room for a wheel chock at each end. I jacked up the trailer and inserted these under each wheel. I found that the extra 3" gave me adequate room to roll around underneath the trailer on a mechanic's creeper.
Interesting side note--I drove from Houston to Defuniak Springs, FL to buy my trailer 2 years ago--been working on it ever since!
Good luck!
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