Sounds like you have most of the major issues taken care of and now have a decent rig. Since you have the warranty and they have done a good job of covering the repairs I would hang on to it and enjoy the ride.
The typical lifetime cap formula for a service contract is based on the value of the rig and the cumulative amount of covered repairs and will adjust over time as the value of e rig declines. Basically the service contract provider will not pay cumulative claims in total above and beyond the value of the rig. You may or may not hit this limit over the life of the service contract and you should read your contract to determine your exact formula.
We have a 2008 315 DS LTD that we bought new but it did sit on the dealer's lot for a year so we decided to purchase a service contract. Best $2k we spent and it has almost paid for itself. After the Forest River warranty expired we've had claims for the dash AC, the front coach AC, water heater and some leaking water lines. All covered repairs.
We love our Georgetown and keep up with all the scheduled maintenance and keep it pristine inside and out. We hope to get another 6 years out of her and then upgrade.
Good luck and hopefully you have all the major issues handled.
Bubba & Chiquita + Two Vizslas (Barley and Sophie)
2008 Georgetown 315DS SE LTD
2011 Jeep Wrangler Unlimited Rubicon
Sterling All-Terrain Tow Bar - SMI Stay-In-Play Duo
Do What You Like - Like What You Do!