I think you need to inspect your plumbing. Starting with the inlet, working out through the rest until you find your issue.
Assuming the water pressure is adequate as you say, what would cause an water not to reach your fixtures? An obstruction? Is there a inline filter that could've gotten plugged? If no filter, could sediment have built up somewhere like a fitting or a faucet strainer or low flow device? What type of plumbing do you have? Is there flexible tubing that could've gotten kinked? Could a valve been turned? Could there have been a freezing event? If your unit is plumbed without tanks, was that a stock build, or was that done after? If the problem is not obstruction, could it be that the water is being diverted elsewhere due to a valve or a leak? Good luck.
2005 22' BT Cruiser 5211, Chevrolet 3500 chassis w/6.0L Vortec V-8; 6'x12' Cargo Trailer; Honda CB500X motorcycle for street and ADV riding; Yamaha TW200 motorcycle for dual-sport and trail riding...All of it for fun and adventure!