Our thought: disconnect when in the foothills of NM as we do not go far to get to our destination of around 8000 ft. SO, one of us drives the RV, one the toad.
The Wrangler at 4,300 lb is said by Gulf Stream to be fine, that if the coach is loaded to max, I still have 6,000 available. Assuming that the load does not exceed the 19,000 lbs.....and I would need to check....then 6000 is theoretical or actually available but that does not address, "is it ok for the engine and tranny?" I like a margin of room, as you.
Right now we took a 3,800 lb Jeep 650 miles our first trip. Seemed to do ok but on some hills in Central Texas really slowed down as I kept the rpm around 1600-1700. Every once in a while it kicked up to 2200 rpm but I avoided it, worrying that I might harm the system at that rpm, and thus the speed could coast down to 40 mph.
I have now read on this forum that the OD switch is off when the light is on; perhaps I would have done better on that first trip with the OD turned off, but no instructions. There is so much to learn! And interesting. Thanks
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