Hi Cindy....we own a 1982 Newell, 36', so maybe I can answer a few questions.....
1) Not sure what the proper RPM's should be on a CAT 3208.....maybe someone else here has that engine (ours is a DD 6V92).
2) On a coach that is 32 years old you can expect a few oil leaks....unless it is a large puddle I wouldn't worry too much.
3) Boondocking.....your biggest areas of concern are your gray and black tank capacities, and electrical usage....the gray typically will fill up fast if you take long showers (longer than a few minutes), washing dishes, etc. Keep your showers to a few minutes, and put a Rubbermaid dish pan in the sink to catch the water you use in the kitchen sink, and then toss it somewhere away from the coach. If the campmeeting provides some sort of pit toilets, or porta potties use them when possible to reduce the amount of water going into your black tank. We have a 120 gallon gray tank, and a 40 gallon black tank and we can go 8-10 days boondocking without filling them up.
4) Electrical/Batteries.......This will be your bigger issue......obviously you will be using the generator when running A/C, microwave, electric heaters, etc. If you are not watching any TV, running the fridge on gas, and not leaving lights on in the bedroom, or bathroom, when you are in the front of the coach, etc., you should be able to make it 8 days using the generator a few hours a day to top off your batteries.....well, let me clarify that....you will probably not be able to top them off, but you will be able to replace most of what you use each day, but you should have enough capacity to go 8 days....again, as long as you are conscious of your electrical use, and run the generator each day for 2-3 hours you should be able to go 8 days. A lot of this advice assumes you have good house batteries that are not too old, and are still able to hold a full charge. If you have flooded cell batteries be sure the water levels are where they should be prior to departure, and that they are all fully charged.
You can extend your house batteries significantly by converting your interior lights to LED's, but that is another discussion.
Have fun!!!
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