2002 chevy truck 4.3l towing questions?

i have a 2002 chevy silverado 1/2 ton with a 4.3l v-6 that i use to tow my 26 foot travel trailer with. while towing notice the tranny shifts harder and seem to be in a bind was looking to by a hypertech programmer but have never talked with any one to see if they are worth the money or just get a bigger truck
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