On the boat, I used "manual" pumps all the time - didn't even have electric pumps (noisy and not as friendly to water conservation). However, I put "manual" in quotes because... have you ever tried to wash your hands while pumping with one hand?
So, I used foot pumps. You mount these either on the floor or in a cabinet adjacent to the floor (depending on style of pump), and then just pump with your foot to get water. Works very well and you have good control of the water flow. I guess they are "pedual"
The only problem I ever had with them was that when I moved ashore I found myself walking up to sinks and doing the foot version of "air guitar"
The Whale "Gusher Galley Mark III" is a very good, very robust pump that pumps on both the up and down stroke; that's what I had in the galley (kitchen). Then a smaller, slightly less heavy duty one that pumped less volume in the heads (bathroom), a Baby Whale (now called "Babyfoot"). I think the latter one would be the right size and water flow volume for a trailer, and I will probably install one at some time in my Boler
. Luckily I have one on hand that I can set in place to try out. I'm hoping it will tuck in under the "toe kick" on the Boler
There is also one ("Tiptoe pump") that pops up from the floor when you want to use it, and then tucks back down flush when you aren't using it - that might be handy depending on your layout.
Here are links to the pumps, all made by Whale. I note that they now have an RV page (they've always been a marine supplier), but not all the pumps are on the RV page - still, you can always look up "whale pumps":
Larger one probably not well suited to an egg (Galley Gusher Mark III):
Babyfoot that I think would work well:
Here's the Tiptoe:
A nice spout for the business end of a manually pumped water supply is this one by Fynspray, which is a New Zealand company. Very good quality and swivels out of the way (Hmm, I see they are almost at half price; I hope they are not being discontinued - I'd better order one now!):