Harry,
Think about your first question.......1. The 18% that comes off the 1st year, is it based on what you paid for the motorhome (after taking off the 35%) or is the amount of deprecation based on the MSRP?
If it were 18% off of the MSRP, the vehicle would be worth more than you paid for it after year one. The 18% is a GUESS as to the amount of depreciation below the sales price that you paid for the coach. Personally, I think the 18% figure is low. I tend to look at the value of an RV at zero and my cost to buy it is an expense, sort of like going on a cruise or buying airline tickets. The money spent is for enjoyment and no return is expected. If the coach has any value when I sell it, or trade it in, that is just icing on the cake.