tom i want to go for 19.5 rubber on my 52 3800 drw.reason is you can buy them up load range g if i remember right.seems like wieght i can haul goes up to 5,000 or more per tire.all depends on how soft or hard springs are so tire dont rub bed or under front fenders.of course weight is also limited by gross vehickle weight.i would just as soon have plenty of tire so i dont have anymore blowouts in toasty summer weather.and off road to load firewood ground clearance is always good lol. gl to you all on your projects