Was looking at my Tow Pac outrigger tires yesterday and it will be replacement time soon... I went online and searched for Load Star 4:80/12 Load Range B and found them at the site below for $28.95... They also have some nice rims too for about 50 bucks each...
http://recstuff.com/4.80-12-Load-Ran...m5iRoC7hzw_wcB
Les