personally I wouldn't even consider turning the o/d off with that truck and that tiny load (unless you have airplane gears and it is shifting a lot) but if you slow down as mentioned above you will save LOTS of gas.
Read the owner's manual... it will tell you what gear to tow in.
The closest truck I had to that one was an old 94 chevy 2500 4x4 ex cab with 4:10 gears... It had no trouble towing a 10,000 lb 38' fifth wheel AND a jeep wrangler on a towbar behind the camper in O/D and I HAVE to believe that your truck is WAY tougher than that old pig was.... the best thing you can do for your trans tho is to add an aftermarket trans cooler.... I put them in all of my towpigs...
I will say that my trans in my dually DID finally give out while pulling at 29k lbs but she had 330,000 HARD miles on her at the time so I can't fault it.
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