Hi!
I have a 2019 Scamp 13 and I am modifying the dining layout. Specifically, I want to screw in a table base to the dining room floor. I think this is a plywood base, but I'm not very carpentry savvy and I am worried about destroying something underneath. I have a water tank on the left and hot water heater / grey tank on the right, so I'm sure there are pipes running under the dinette. I'm also concerned about the screws coming loose from vibration.
Could anyone recommend what I should use to screw the base into the subfloor? I'm thinking 1" screws.
Many thanks in advance.

Do you have a gray tank, where is it?
I suggest crawling under the trailer to make a careful inspection before drilling or screwing through the floor. If you had someone under the tailer and someone inside to tap where you would like to drill or screw, you could probably identify whether the coast is clear or not.
I looked quickly and it looks like the Gray tank is exactly where you are considering the pedestal be mounted. . and It is tight up against the plywood on our 2019 so any fasteners penetrating thru the plywood would be thru the tank top too. Look carefully. .
2019 Scamp 13 standard
where are you going to sleep?
gwhaile