Yes Thousand trails will give you the ability to stay up to 21 days, it will depend on the membership you chose, I suggest you talk to a membership specialist. As to the age of your rig, it's been my experience so far in thousand trails parks it's more about the condition of the unit then its age, happy camping!
Join Thousand trails is $600 year. Really worth it if you live full-time RVing like we do. Btw our RV is a '99
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