If the brake fluid is black, I'd suggest you flush it with fresh fluid. Hygroscopic - it picks up water over time.
Trans fluid change - if it's not pink or smells burnt, the trans is at risk. Look for shiny stuff in the pan if you do it yourself (very messy) - normal wear materials are black.
See if you can check the fuel hoses for damage. Another bummer to avoid.
A leaky yoke seal on the rear axle makes a mess and low oil will eat a perfectly good ring and pinion - this is a good task for a shop - BFW required.
Check the steering components - a good alignment shop can suggest overly-worn-out parts. Break an under-lubed ancient ball joint, and you'll have a bad day.
Obtain some POR-15 and treat any rusty areas out of sight to arrest further damage.