First time used buyer, any specific advice js appreciated!

Treat it just like a copter you've never seen before and have just been told to make it airworthy.
In one of that vintage you need to crawl under with a flashlight look for unusal wear of everything, bright metal usually trouble underneath. I would check as much of frame as possible looking for any signs of damage, cracking or especially of past repairs. The outside front to back top to bottom. Look for proper roof maintenence, seals around any protrusions through the exterior skin.
Propane storage and delivery to points of use. Hugh safety issue. A cracked propane line is not good, I traced all mine visually as much as possible before I bought.
Interior others have addressed, make sure everything works, spend a day in it, pull all draws out and look behind for evidence of past structural repairs also.
Remember, if you can't find anything wrong; dig deeper. Get past any cosmetics someone may have done to hide past damage.
Good luck brother, I understand staying in paygrade, prior USN E6.

With your background, checking out the mechanical areas should not be a problem.

I found one link with a little info...and it has a link to a safari group on yahoo that might help. Look in the 5th post.
Thread about safari

Hopefully, Wolfe10 will see your post and join in. He has a lot of knowledge about the Safari coach.

As already posted, very important to look for water (leak) damage. Easily the most destructive force to attack an rv ouside of a wreck.

Good luck.

Fred

X2 search for water marks, find them ? RUN.

If there is mold, mildew, rotten wood, anything like that. Walk away there are rigs that are sound.
No 'deal" is good enough for a beginer to have to rebuild the rig.