Was the parking brake set initially? It’s virtually impossible for brakes to “freeze stuck” otherwise, unless they were already had a sticking caliper or wheel cylinder or parking brake was set, when parked.
Starting? Ford V10s are fairly bulletproof. Does the fuel pump prime with key on?
And how long is “over a year?” That’s a pretty broad description. Running when parked, a year or year plus should still result in it starting.
If “over a year” means 5 years, different story.
Hope your friend appreciates your generosity. And hope you only paid for a non running rv.
