right now i have a 2001 gmc cc 8.1 allison. i use it to tow my racecar (9000 lbs trailer). its stock except for a tune. since the new gmt900 trucks wont have the 8.1 i'm looking into getting the 6.0 and adding a supercharger. a radix looks the best right now. i want to know how well they hold up towing 15k miles per year? i really don't want a duramax but want to have good towing power from 1500-2500rpm. the stock 6.0 wont do it. i also like the idea of the new 6 speed auto coming out for the 6.0. whats everyones opinion? what does a 6.0 make for hp with only a radix added? i probably wont do a cam or headers ect..

thanks