Re: 19.5" tires?

19.5s have higher carrying capacity all of the way up to 5000 per tire but is dependent on tire. They may or may not be larger overall diameter.

You can search here including archives to get a lot of detail on why upgrade. The best compiled information I've found is actually at the Rickson Tire site. http://www.ricksontruckwheels.com/tires-24570R195.php for example.