Power a trailer with a generator connected to the axle?
I just rewired the family's "camping trailer" and the next project that I have to tackle is power. Don't ask why we need a bunch of power when camping, it makes stuff more fun. Anyhow two of the ideas my dad and I have are theoretically easy. The first one is something that is really simple, just some solar cells. However my initial thought is that it may not be enough to power the car/marine batteries on the trailer in a manageable amount of time (with a small budget). The second idea is to connect a generator head(s) to the axle of the trailer, so whenever we are driving the trailer (often for about an hour on the highway) the batteries are charging
My questions are, what type of generator heads (if that is what I want) should I use? What type of gearing would I need? Could this be worked on a humble budget? Would this be practical for charging car/marine batteries?
Thanks, Jake J