You checked only the pump.
Take the strainers off the faucets, disconnect the shower head.
Run a considerable amount of water through the system while you check the strainers and shower head for stuff.
Replace all parts.
Spend 10 bucks on a pressure Guage to check reality vs expectation. Your 75psi home pressure is not the same as your 45psi rv Pressure.
Check water pressure.
My shower head, not the pump was clogged with plastic. My pressure was fine, the VOLUME wasn't. Two different things volume and pressure.
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