Is this a class C with a basement storage area? Is it near the wheelwells?
Many times I have found them near the tank, and that is under the floor in a outside basement compartment on my 97 Bounder by Fleetwood.
My 72 Coachman camper it was near the water tank, under the same cover that you can lift to drain the tank, or check the water level.
Many times it is under the dinette seat, but not in this case. If you have twin beds, try removing the mattress, then look for a removable plywood cover under the mattress.
Look under the RV, you might see what compartment it is in?
I found that by installing a accumulator tank, my water pump is much more quiet. Also flex lines - like found at the hardware store to hook up a 1/2" faucet to the shut off valve will work to take away the noise and vibration!
You do not need to install the accumulator right next to the pump, though that is idea, it can be on another faucet, or a tee anyplace in the lines. If no space near the pump, then install a tee to the line going to your kitchen sink, and hook it up there. It will take out the surging pulses of water pressure that the pump is creating. So best when it is close to the pump as possible, but will work in a remote location too . .
Have fun camping!
Good luck!
Fred.
Money can't buy happiness but somehow it's more comfortable to cry in a
Porsche or Country Coach!
If there's a WILL, I want to be in it!
I havn't been everywhere, but it's on my list.
Kangen.com Alkaline waterEscapees.com