refried
Adventurer
I say use a non pressurized tank, then a pump that pressurizes the water outside the tank in the lines coming to shower you with water, that way the tank could never rupture from overpressure and you could run the line anywhere to shower.
I've got a pump mounted near the back doors of my van and a 5 gallon water container. if I want to use the shower I move the water close to the pump, stick the hose in and turn it on. If I want a warm shower I'll heat the water on a stove first or just let the water jug sit in the sun for a few hours. I've thought about conecting it to the water system on the van but it only has a 3 gallon water tank and it's nice to have an extra 5 gallons of water in a portable container. If I need some privacy I'll wrap a tarp around the two open back doors and have an instant private outdoor shower.