water tank secured??

[harley]

Just noticed when I drained the water tank that if I push up on the black under skirting below the tank that i can actually move the empty tank up and down a bit ...is this normal.
I have a 2013 Sunset Trail Reserve 25rb TT

[geondebi]

I am not sure if things have changed since they built my trailer but the fresh water tank sits on a piece of plywood sitting on two pieces of angle iron. On my unit the tank moved and rubbed on the screws putting a hole in the tank. Some have put a 2x4 on each side to prevent it from moving.

[Stan]

I can move mine as well when it is empty. Seems to be somewhat normal. You can also move the black and grey tanks the same way but they do not move quite as much due to the glued pipes attached to them.