Mobile55: We are very excited for you as we would be for all first time RV owners. However, many will also be jealous, in a good way, because you obviously bought this RV cheap, and we all know you will be very happy with your decision after you take care of a few things... and then you will basically have a new coach!
More Questions To Satisfy Our Curiosity - And So We Can Help You Get Started:
* I get the impression when you say the inside is "trashed" that you don't mean damaged? ...Is it just dirty or are all your day-night shades ruined, etc?
* What city is this coach located? Is it humid there? (...So we can recommend a place for you get paint and/or service near you.)
* Is your fuel tank full? How much is in it?
* I highly recommend Michelin Steer Tires with a bag of "Equal" inside so you never need to balance the tire, but many owners say they like the Toyo tires because they are less expensive. (Just don't buy the Michelin RV tires... as I wish Michelin would take these tires off the market... but that's just my opinion.)
How to get your coach rolling with maximum care -- before you start your engine:
* If you HWH-Jacks are down... clean and spray with WD40 before you cycle them.
* Drain all your 15-40W oil and filters in both the engine (~4 gal) and generator (3 qts). This is easy so don't let your unfamiliarity scare you. Just watch a You-Tube video. Tip: Find a DEF funnel at a local gas station you know services a lot of diesel pick-ups. These guys use DEF jugs and throw the funnels away, and the funnel is perfect for refilling your engine oil. You also can use those 2.5 gal Def containers to hold your old oil.
* Depending on how much Diesel fuel is in your tank you have to assume it has algae in it after 5 years. ...And this is where you need to do some investigations. (Note: Someone with CAT experience may correct me, but this is what I would do.)
BEFORE STARTING YOUR ENGINE -- DON'T BE IN A RUSH
==> First you need to find out what what condition your fuel is in an if you have any water in your tank?
Since I'm not familiar with how a CAT engine gets primed, I am reluctant to say this, but if you had a Cummins with a 12V lift pump this is what I would do:
* Get a bucket and surround your primary fuel filter with the bucket. Then unscrew your primary fuel filter just enough to break the seal. Then turn your key on (but do not try to start the engine) so the lift pump pump pumps fuel and water (if any) into the bucket for your inspection. ...And if it looks good you can proceed to start your engine.
Note: If it smokes at first it will probably go away after a few minutes so don't worry about that.
* You can add any number of diesel fuel additives, and let them work their magic over night or for a couple days, but if you don't have much fuel I think I would first dilute it with as much new fuel as you can easily transport. Or you can just and a higher concentration of fuel additives and biocide. (The biocide is most easily found on Amazon.)
* I would also order engine and generator oil & fuel filters on Amazon too!
HOUSE BATTERY OPTIOINS
If your battery tray can accept 3-12V batteries, then you can also fit 4-6V-GC2 Golf Cart batteries in that same tray, and usually golf cart batteries are more durable and cheaper. This is the route I took last summer, because Costco was offering $90 Golf Cart batteries (x4, plus tax); and then you can order 9" battery cables on Amazon. (1-black and 3-red would be my recommendation.)
==> Also, you want to orient your batteries so the negative terminals are "to the rear" in your battery tray. This is so if you ever need to jump your house batteries the negative terminal will not arch against your door hardware when you connect the battery-jump-cables.
==> New house batteries really need to be equalized and charged for 1-2 full days before you start using them, but you can cut-and-run with off the shelf batteries if you have to.
==> Also the right way to connect your positive battery cables, and negative battery cables, is on the furthest posts. However, I my situation, I had trouble putting all these cables on one post. So I bought a piece of copper stock (on Amazon) and cut and drilled a few holes to achieve this configuration. (See picture.)
ENGINE BATTERY OPTIONS
Your old engine batteries are typically sealed 12V-950CA. However, you can't find them everywhere. A Semi-Truck battery store will have them, as will freightliner, but in major towns you will get a more competitive price. So shop.
Easy... Just find a YouTube video to watch first so you can gain some DIY confidence.
Like your diesel engine it will feel foreign at first, but you will quickly learn that changing fluids are not much different than servicing your car! ...You just need bigger wrenches and bigger buckets! ...In fact, I keep 2 plastic laundry bucket on hand for my fluid changes.
and... I keep extra fuel filters when I travel on the road.
Please keep us posted as you make your way around your RV.