Probably, but you also probably wouldn't want to pay the monthly fee that they would have to set. The older (and more at risk of failures) that a unit is, the higher the extended insurance rate (sort of like a driver that has a bad driving record will pay a lot more for his or her insruance than a good, lower risk driver. Now extended warranties and auto insurance are very different, but I am using this for comparison of how they set rates).
I can't say for certain that any company will give you an extended service policy on a unit that old, but if they do, it's going to cost ya. I think you'd be better off setting off money aside in an account for repairs as they arise.
I would really read the fine print. I got an extended warranty when I purchased my new Class-C. I am really glad i took the time the first week and read the fine print. There were so many exceptions that basically just about any hose, wire, tube, pipe, nail or screw was not covered. also any damage that occured because any of the above failed was excluded. I started having trouble finding how anything could be covered so i canceled the policy on day 10.
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In my opinion as a QS9000 and ISO/TS 16949 Quality auditor the word "Quality" does not appear to be in the RV industry dictionary.