Get a Ready Welder. The Premier works, but not well, and stick electrodes don't do well on the trail bumping around. The high output alternator would be cool to have, but not $1200 cool.
The ready Welder is $490ish, totally portable so you don't have to do the chinese fire-drill when you have the welder at the front of the pack and the broken truck is at the back, just grab the case and go, also handy if your truck isn't going on the trip. They work great and flux-cored wire is durable as hell while bumping around on the trail, keep the whole thing in a Pelican case and know you'll be ready whenever the need arises.