Enclosed underbelly

We have access panels pre-cut ( for valve access, etc) with a wooded frame surrounding ( inside the underbelly skirting) the access. Remove the tape and a few screws, and your there!

However, right now.....about 2/3’s of the underbelly on our 40 footer is on the ground right now. Needed to do some work inside the “belly” and run a gas line, for an Olympian Wave heater. It’s a pain to drop and even worse to put back. But, when you camp when below zero F.....it’s kinda necessary!

On our last trip, we noticed water had dripped from the rear, slotted drain/vent hole in the underbelly. It sucks not knowing if it's due to an overflow, leak, etc..

Ours came from the factory with access openings already cut and then resealed with screws...areas for dump valves, and a couple of electricals.

I haven't had to open them yet

Because of the dump system, long story, I have to open a small section everytime we dump black water. Seal it up everytime with metal type tape.

The hard part is learning where to cut open without cutting the wrong area or too much or too little so you cant get at where you need.

I opened the underbelly on our last trailer one time in 13 year (for modification). Since it wasn't a normal thing, I just used the screws securing it rather than cut more holes.