Right from the demo walk through, I was unhappy with shower pressure when demonstrated! A trickle?
And we have good water pressure at our campground! The service tech who set our RV up in our permanent seasonal spot said sadly not much you can do, unless you want to change out the faucet. I pulled a dumb dumb and drilled more holes in the head, this totally ruined it. In talking to another dealer the tech was misinfromed on that advice, it is the shower head.
Searching the internet I found the oxygenic's shower head. Installed it and love it. Doesn't use any more water, but the pressure is much improved.