Welcome to the forum, I'm sure you'll enjoy your new hi-lo. Having mine for about 7 years, it's nice to get-away for the weekend plus it's a great hobby since I've been banned from the house once we finished the the remodel (had to do with putting to many holes in the sheetrock). Good luck on finding out more on your hi-lo, everyone here are very helpful and I'm sure there are members here that have worked on trailers from the 70's. I'm always learning something new or modifying the towlite I have.
2006 22ft towlite (replaces 97 21TL)
2006 Toyota tacoma pre-runner 4.0 L V-6 quad cab
w/ 98 chevy Powervision towing mirrors