Many threads here on this same topic findable with the search feature.
I am typically not a fan of such warranties, as over the long haul of life you will come out cheaper being self insured. That said, I do think an extended warranty or service agreement can have a place in the purchase of a used Motorhome. Obtain coverage with a high deductible for one years term as a mitigation against high dollar latent and unknown issues. At the one year point, after having history and experience with the coach decide whether to continue or not.
And buying from the dealer is usually not the best coverage or value. The dealer will be trying to push it on you as it's very profitable for the dealer. Look elsewhere.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.