I'm looking at the Ford F350 Diesel Crew Cab 4x4 DRW 2013 truck with an 8 foot bed. Planning on towing a 5th wheel trailer with 12,400 lbs dry weight. On the "Build your own" website, they are showing the following options for gear ratios:

3.31 Electronic locking axel ratio
3.31 Non limited slip axel ratio
3.55 Electronic locking axel ratio
3.55 Non limited slip axel ratio
3.73 Electronic locking axel ratio
3.73 Non limited slip axel ratio
4.30 Electronic locking axel ratio
4.30 Limited slip axel ratio

Any advise as to which of these options would be the best? Planning on being "almost" fulltimers 6-8 months of the year traveling around the country staying a few weeks here and a few weeks there before moving on.
Thanks .... all info appreciated as this stuff is like a foreign language to me
Marilyn

 

you are probably going to want the 3:73 with electronic locking diff. . .this will give you a medium gear, enough low end for take off and when you wanna stick your foot in it. . yet give the truck room to stretch its legs out going down the freeway with a load and better on fuel then a lower gear. the locking diff will give you the traction in 2wd and the more even wear on the tires that you will be looking for on a rig for road use.