89 or 93 octane for towing

[Goadus]

On my GMC 2500hd I pull a 5th wheel camper. If I want to spend the extra $$$$, would it benefit me to go for the 89 or 93 route as far as Torque and HP? Or leave the stock tune in it. Keep in mind I am a complete newbie. Thanks in advance.

[mikel]

93 will provide the best torque gains for towing with the 93 diablo tune, up to you if the extra torque is worth it in that case for sure.