The Questions I asked and maybe forgot to ask

 So when buying an RV that costs more than my first two houses cost, I needed to ask some questions here is the list I had when I actually bought it. I have rearranged this into probably the highest priority items to the least most important. 

1. How Old are the Tires?
2. How old are the batteries?
3. Are there any problems that I need to know about?
4. What was the last Service Date?
5. What is the Leveling System? 
6. How many hours on the Generator?
7. What type of hot water heating system is there?
8. Does it have all of its remotes and controls for all its systems. (TV, rear lift, any other system)

Some of the initial questions before we even saw it that were answered. 

1. How many miles are on it?
2. Are there any major things wrong with it?
3. Does it have any Guarantee or Warranty?
4. Is it an AS IS RV?
5. Is there any body damage outside?
6. Is there any damage on the interior?

Many of these are very important, like tires, batteries and miles. The main reasons is because these items are important to the function of the RV, and they are also expensive if there is a lot of use on any of them. Here were the things to consider for each of the main items. 

• MILES. if there are a lot of miles on a GAS engine then that will tell you if there is much wear and tear on the engine. On a Diesel, lower miles is good on a newer model, but lower miles on an older system may indicate a lot of sitting. If you have a 7 year old coach with 42,000 miles then you are looking at about 6,000 miles a year. That means the RV was driven and used and if you look at a per day mileage then about 16 miles a day driven. So this is a well used RV, which should be a good RV with minimal use, but also should have service records and should also have all the new kinks worked out of it. 
• BATTERIES. Every battery slowly will lose its ability to stay charged or provide the intended power. Knowing how old they are will help you to know more about what the coach power position is and if the batteries will need replacing anytime soon. Replacing 6 batteries, is an expensive purchase. Batteries can run $300 each for AGM so it is expensive, but regardless of how old they are I will still be testing them, and will be changing them out soon. 
• TIRES. this is the other very expensive thing to track and make sure they are not "aged" out. if you do any search you will find many different opinions, however the consensus seems to be around 5-6 years a tire should be replaced. If you look at Consumer Reports they say they should last 10 years. However, there are many sites and many opinions, but I tend to trust those who are on the road either Full Time RVing or traveling a lot. They seem to believe that Tires should be changed out after 6 years and they are expensive. They will run about $600-$700 each and then labor to mount balance and other fees can push this to around $5,000

Keep these in mind first and foremost there should be many more that you need to ask and most are probably based on your individual RV here are some other things to ask. 

1. What does the Water Heater Anode look like?
2. What does the House and Coach battery compartments look like? (dirty and corroded, means NO MAINTENANCE)
3. Are there any leaks anywhere around the RV, look at the bottom after driving it and see if there are any water spots or drips?
4. Check the Sidewalls of the tires? are they cracking? that means they have been exposed to a LOT of sun. 
5. What is the model of the Refrigerator? (so you can get filters or other parts)
6. What is the model of the Filter on the water system? (again to get filters)

Don't give up and keep searching to find something you need to know to make a decision.