I am wondering has anyone used a Mobile Wash system using an small utility pump(northern tool) type, a small 30 gallon water tank, with the fire hose nozzle. Will it work: can you get at least 50 PSI out of this set-up? Has anyone typed tried this? Keep I mind I would still employ a electric 1400 psi pressure washer for the heavy stuff. Thanks any thoughts or ideas would help.