Gear Vendor/Gear splitter

I know every vehicle is different and we all tow different trailers but my personal set up will go down the Grapevine and the grade going into the desert east of Alpine,Ca in overdrive and not gain speed. I tow around 7,000lbs @ 62mph or under and just let off the diesel pedal and coast. No engine brake, no exhaust brake.

Maybe some day I'll get a big trailer and see what happens ;)