I have yet to get anywhere near a LR with my mig, I only really uses it for bodywork. But I use my arc on kit car chassis and fabbing stuff for them. The chassis on KCs are usually F off thick!
The number of MOT guys who look at them, bang em with a hammer and come to me and say, "Wish all cars had those"
The windscreen surround on my Marlin is welded to the chassis, makes a roll over bar as well and is shaped in a 20 ton press. Cars have gone end over end and peeps have survived. This was one of the reasons I got one.