Not an Alpine Owner yet, but if the brakes are hydralic, you probably need to change the brake fluid. Figure $200-400, depending on how bad the fluid is. If Disc Brakes, the saddles will need lubing, which may reqire all wheels to be removed. More $$$.
Figure you will need tires about $3000, All fluids changed, oil, coolant, possible transmission fluid, figure $500-1000. Batteries, figure $125 each if needing changing. Possibly cables? Belts?
If you are not a good mechanical guy get someone to go with you. There is probably nothing or not much wrong with the coach.
However get a good multi page PDI sheet, and check every thing. Roll out every awning, look at every thing, turn everything on, take a digital camera and take pictures of everything. Under it, chassis components, inside of every thing, go home and look at all the pics, then get quotes for needed maintance, and then, make an offer.
I show NADA book to be $82,420-$99,370. You are probably looking at a one of a kind coach, but you will need to spend some $ on it. Wholesale is around $66K.
Have a great trip.
'96 Safari 3540, 300 CAT, Fulltimmer since 2000