Need some help..my WD-45 stripped [no hyd. pump ,PTO shaft or gears ,no rock shaft ,fenders ,or factory drawbar] weighs 3640 with me on it ..tires are 18.4 X 26 ..10 ply combine with very heavy rims..would like to pull 3500 ,4000 ,& 4500# class..stock engine...need advise on tires..have a set of 15.5 X 38 tires mounted on open centers & could weld spokes to 8 bolt center or use factory PA rim & cut out the adj. part & weld spokes in...what size 28's ??also have pressed steel set of 16in. X 34 rim's [no tires]I could adapt..this is to much to think about...thanks for any advice...Marvin