Correct, I can no longer use the Thule Transporter Combi box on a 1.25" hitch--only 2" hitch receivers unless I purchase or weld my own adapter.
Pictures attached. To cut the shank, I basically measured the clearance I wanted from the trunk + an inch or so and then used an angle grinder with a cutoff blade to lop off the appropriate amount.
Tapping the steel was a pain, but I do appreciate how secure the box is with it.
I completed my recent 5,550 mile road trip with an average efficiency of 261 Wh/mi. I've noticed a LOT of strong tail AND headwinds this year which make range estimation tricky. I used to be comfortable cutting it close to <5% from Supercharger to Supercharger, but I'll probably avoid doing that if the strong winds become the new norm. I was able to charge like normal at all superchargers. Backing up without a camera is fine once you get used to using mirrors and turning your head around all over again
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I also have a super light Harbor Freight ATV hitch cargo rack that sells for $60~ new (last pic). Throw on some appropriately-sized footlockers and the efficiency is pretty much the same as stock. No trailer lights needed if your footlockers don't block the taillights.
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