Some trucks have a speed limit on how fast you can go when in 4x4. Usually around 45 or 50mph
I had mine go 98MPH in 4wd in the 1/4. and that is with 550hp at the wheels and a boosted launch at 20psi, so I think it would not hurt much at least in my truck. my buddies truck hit 120 in the 1/4 in 4wd
I use on-demand 4WD when maneuvering in wet grass on my property. Otherwise, I have only used it once: when backing uphill into a gravel site while having to turn the front wheels pretty sharply. The back wheels started to spin, and the 4WD solved the problem.
I have pulled a four place covered snowmobile trailer weight around 7000 lbs in four wheel with a 2002 Yukon for thousands of miles all over MI and Canada. Always used 4 auto and never had a issue. Check you users manual or check with your dealer but thats what I bought mine to do.
The hubs had to to that just this past weekend. He was hauling a cattle trailer full of equipment and not the TT, but still. Put it in 4WD till he got on solid ground, then back to normal.
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