Stayed at a few Parks with very high pressure. One was 85 lb, loved the shower, and a couple at 100 psi or so. Don't remember exactly or where.
Brother has 100+ lbs pressure at his home. He uses a pressure regulator except at faucet next to driveway. Many hoses have burst usually at the fittings.
hard to find sturdy high pressure hoses. One I remember was big thick black hose. Forgot to turn the faucet off and nozzle closed. He doesn't use a pressure washer on hid driveway or car. It will shoot a stream one inch hose beyond the other side of the road.
The new flexible piping in MHs worries me. Our is an 05 and handles 85 lb no problem but the new stuff I'm not so sure.