It’s unusual to find a paved road much steeper than a 33% grade. Filbert street in San Francisco is about 31% I think, and is one of the steepest in the SF Bay Area. 100% grade is 45 degrees, so 33% is about what you got, 15 degrees. That’s very steep to be jacking up a car, so be extremely cautious. One idea for added safety, park another car up higher on the hill than yours, and tie a cable between them.
In neutral that should be ok as far as the drive train. But it could damage the brakes or possibly the suspension. You need to have a method to prevent your car from crashing into the truck also, should it suddenly come in-stuck. For example the idea above, parking another car further up the hill with a cable to hold yours. This, presuming the pulling truck is below your car.
IMO, overall you’d be better off to follow the advice above, hire a flat bed tow truck to remove it from the spot it is located, either to a shop, or at least a flat spot where you can work on freeing up the rusted brakes.