Lemont, my first comment would be to not put the retaining wall at the back bumper of the TM, as the TM opens by pulling on the rear shell. Thus, you need standing room behind the bumper. The shell extends about 3' from the bumper, so 3' is the minimum I would suggest. 5' is better, so you have a little room to stand behind the shell to push it closed. I pull mine from underneath if I don't have room to push from behind, and that also works fine. You just need room to stand behind the bumper to open the shell.
What size model are you looking at? Used go from a 19' "mini" up to a 33' model. Big difference in distance from the tongue to the axle.
Welcome to the forum, and ask whatever you need. Don't forget to search for some answers, as you may find others have already asked. (I don't recall a situation like yours before, so I am not suggesting you may have found the answer to this question with a search.)
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