| you can fit 305's on a GM truck but you need wider wheels then the stock 7" wheels so i would highly recommend just staying with the 285's and all you need to turn the T/Bars up is a 3/4" socket and find the torsion keys under the truck and give them both roughly 3 turns..if you want something a little taller then the 285's but not as wide as the 305's go with the 295-75R16..
__________________ James 
TyreBoyz Pulling Team
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