No such thing as "too much power" lol! But some have feet that are heavier on the pedals than others
Yes the trailer I was towing had brakes. That was the worst situation I've pesonaly had but I've seen others with short wheel base vehicles. I'm not saying it's not possible, just that I MUCH prefer a longer wheelbase for towing.
Wranglers here in the US have coil springs as of 1996. Not sure about your side of the pond.