New here. Looking at a 1996 Safari?

Chassis suspension parts will be your problem but with only 55K miles, you have a lot of mileage left before you have to worry. Find a Safari forum and ask a bunch of questions.

We have a 2001 Beaver 40' and have not had issues with most parts. Every once in a while it takes a bit of searching for a part, but they usually can be found. I would not be too worried as far as the parts. Just be sure you check it good for leaks that haven't been addressed before. The Beaver we bought we thought we had checked it out real well, and after buying it I found the passenger side wall had leaked and wasn't repaired and rotted some of the floor that I had to replace.

All the appliances are standard in motor homes so getting parts for the water, refrigerator, propane, stove, furnace etc should be fine. CAT IS still around as is allison so the short answer is
Do not worry about parts

Make sure you check the DOT code (date of manufacture) on the tires. Yes even though they look new if they are over 7 years old they should be changed. RV tires dry out from sitting and the damage is not visible. A blowout can cost thousands of dollars of damage to your rig. Tires can last more than 7 years if cared for properly BUT you do not know if the were covered if sitting for long periods, pinched on curbs and a bunch of other things. SO crawl under and write down the 4 number code.
First two number week of the year last 2 numbers year. SO a tire with the code 2515 would have been manufactured the 25th week of 2015.
Tires are fairy expensive but blowouts can be more expensive