i have a 1/2 ton as well, the huck brake to bendix conversion is somthing i wish i had done with my truck when i redid my brakes. i didnt cause it can cost quite a bit to get all the pieces and parts needed for the new brake system. if you can afford it and dont mind doing a little bit of tweeking, its definatly worth doing. you dont want to have to be looking all over the place for the rare huck style brake parts and then having to pay the price for them as well.

chevytrucks.org has a good explanation on making the converion. check in the technical area. good luck.