Psh, me too, 6'2'' and 265 and I have no problem.
Hell, I don't even bend down, I just kneel in the water all the way around the car to REALLY get that crap off, since of course, thats where the worst of the road grime is.
Only use dish soap if you're going to wax it about twice and treat any plastic trim or rubber seals with protectant afterwards as dish soap has absolutely no moisturizing effect that good quality car washes have.
And like, for wheels, hell, if they're really dirty, I just take them off, one at a time and clean the insides and out and then wax them. As they have the same clearcoat that needs protecting. Don't know why I mentioned that, but hey.