Been chipping away at the undercarriage. After much research, I decided to go with Rust Bullet over POR-15. From what I've read, it provides better results with little to no prep work required......even though I'm prepping anyways.
Should be here some time this week.
Other than that, I've discovered that the e-brake is on its' way out, which isn't a big deal, but something is kinda funky with the turn signals and hazards. Might be a relay, bulbs, or both, but since the truck isn't on the road yet, I'll take it one step at a time and finish up the undercarriage first. No rush.