I have a 5x12 because I can't fit anything wider into my garage. That limits me to 52 or 54" mowers but for residential its perfect. I dont have trouble parking a 5x12 and the trailer tracks really well behind my full size pickup. If the truck can clear whatever your driving by the trailer will clear (except for very tight turns). I think the 5x10 will serve you well.
Stihl, Exmark, Cummins, Powerstroke