I found my buddy a 3/4" drive set on CL a couple years ago. (I myself don't work on stuff that big.) Grandson was cleaning out late Grandfather's garage and shop. Got it for about 40 bucks, as I recall. Breaker bar, sliding T-bar, extension, and a mess of sockets, all in a hand-made wooden tray - WWII vintage. A lot of it was Wright. Rest was all oddball mis-matched.
So I asked buddy a couple weeks ago "You ever use any of that 3/4" stuff I gave you?"
He says "Yeah, I was working on a piece of tracked equipment. Had to run home to get
the big socket set. Told the guy "find me a piece of pipe"."
He continued "So I got back about an hour later, and the guy dug out a 10-foot piece of pipe for me. Put it on the breaker bar, stood on the hood of my car and jumped on the end of it. After about 3 or 4 jumps, that nut finally broke loose."
So.... yeah: as said above: find an oldie on CL cheap. One that "Grandpa" already put to the test, and you'll be fine.