Welcome to PHP land. Cody is the expert, but I just want to back him up. I tow a 5th wheel that is almost 14,000lbs and depending on the conditions I often tow in the 65 Tow tune. Most of my time is probably spent in the 40 Tow. With the weight you are talking about 80 Tow would be fine. Just make sure you have a way to monitor EGT.
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Bob-
2003 F250 Lariat 7.3PSD CC SB FX4
Kwik (6637) Filter, RE 2.5" leveling kit, F350 Rear Blocks, TC Lock, Fumoto, EBPV/Exhaust Brake,6.0 Tranny Cooler, AIH Delete, IssPro EV2 Gauges, PHP Phoenix stock, 25tow, 40tow, 65tow, 80dd, 100perf, In-tank mods, Muffler Delete, WW, FRx,HPx, JW Stage 1 Trans, Swamps HV/HF IDM
-Pulling a 38' Forest River Sierra 5th Wheel
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