Have you checked pressure just at the spigot, or at the hose right before you attach to your city water connection?
I'd use that point to determine if the problem is internal to the rig, or external in the hose, filter or water pressure regulator. If all that's hooked up and fine, then next I'd determine if the pressure issue's on all taps (including shower and toilet) or just with a few of them.
If on all, then you'd be looking at either debris at the city connection itself, or possibly a failure in the water pump, allowing water to backfill the FW tank, and therefore lack of pressure until the tank fills. I'm not familiar with your unit, so I'm not sure where you need to look to check for these.
If you think it might be the pump, it could possibly just be debris in the check valve. Running the pump *might* clear that debris, allowing the check valve to close, and no more loss of pressure.
One thing you could try though if you're stuck is running from the FW tank itself. I've done that once in my TT at a park that had low pressure from the spigot. Just filled the tank and then used the water pump to keep the pressure up. Refilled the tank as needed.
There's no use crying over spilled milk, unless it's on your keyboard.