Pictures of tow vehicles and trailers

I am not sure what handles you are referring to but to check and find out if the tank that heats your water is full BEFORE you turn on your electric heating element, you will find this water tank (it's small, it only holds 6 gallons of water) behind a black metal door on the slide out side of the trailer below the window on the front of the trailer.  The black metal door has 2 air vents in the door. Open this door and you will find the pressure relief valve that I referred to, it should be a brass valve located near the top center of the tank, this valve has a small handle on it and it is just like the one on your tank that heats up your water in your house.  Hope this helps.

If you got water out of the pressure relief valve on the tank that heats the water then your good to heat up your water either electrical or via LP gas. As far as the screws I wouldn't go over 1.5 inches I think that the flooring is 2 inch but you will not get any more bite on the screws after going through the top piece of plywood which pretty thin, because under the plywood flooring is (I think) 1.5 inches of foam insulation other than the random aluminium framing in the floor. Hope this helps and you can also look up links on this forum about the construction links to the R-Pod trailers this also will help you to understand where the floor bracing will be located.     

Our '18 176T and tow vehicle along with other paraphernalia at Lakeport, Michigan.