If your wheeling you shouldn't be alone.
So you should have at least 2 batteries in the group.
I would toss my batteries in the Jeep to go to friends house to do welding. It's not that bad.
RW has a few models. I have not looked to see if they have one that will work on 110v. I know they have one that can work off of a stick welder in a shop.
If your thinking of a Trex for mostly home then bringing it wheeling it would be a fine machine. But the size of the unit and the extra weight for wheeling in a Jeep, I'd rather have the RW.
It's only ligher because it doesn't have batteries but then it's a working standalone box. You can't be lugging two or three batteries around with you.
Yes, you can use 110-120v as well. I thought the RW had a 110-120v adapter available as well?