Given your usage, my recommendation would be:
1) Stock
2) 40T
3) 65T
4) 80DD
5) 100P
6) Empty, High-Idle, or No Start.
There really isn't much need for anything else unless you plan on pulling more than about 10K to 12K, in which case I'd throw a 25T on as well. The 65T would be fine for pulling the fifth wheel in most situations, and the 40T would be just in case you get into some sticky grades while loaded.
I hope this helps.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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