Hi ChiefKB,
When I first got my '07 3400RL, I worked on it for 2 month's before I took it out. I dropped the bottom plastic and insulation and did many mods, one of which was installing a tank monitoring system. Dropping the plastic is a good idea so you can attach, support and isolate 'things' that rub on other 'things'; wiring, hydraulics, so on. I routed wiring, rear camera cable, and so on.
It is a lot of work, but worth it.
Welcome to the Forum, we are glad to help you in any way. (You may want to list your trailer model and tow vehicle so we can address your questions better)
Ozz
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