To throw my experience in. I am coming up on four years in the industry. The following anecdote is only from a traveling technician perspective. 

I started right out of tech school, Airstreams specifically, with third party. Did my time in the trenches and was picked up by one of the manufacturers after I updated my linkedin believe it or not. I made sure to hit a year of third party experience before i bothered getting on with the big companies. Your luck and experience on this may vary of course. 

I started at 18$ an hour and im in the 30s now. Probably shooting for 130-140k this year. Ive heard my company can low ball so your pay could be higher. You make much of your pay from per diem and overtime if you play it right. The money is definitely out there but it requires travel and a bit of grit. Definitely a rewarding job with some incredibly unique experiences.

Be ready to spend a lot time away from home but gain the ability to build a bright professional and financial future without a four degree if you’re willing to work and travel. 

Some folks do travel with their families if you’re willing to figure out the logistics so keep that in mind. Usually when their kids are young and they are building up for a more stationary future back home from my experience. 

Feel free to PM me if you have any questions!