Extended Warranties are a type of insurance so you need to look at what you are comfortable with having...or not having. In our case this is what we bought:
Since we have a Ford E-450 chassis I bought Ford's Premium E
lan. $100 Deductible, 7 Years / 75,000 miles term. Purchased from my local Ford dealer and good at any Ford dealership in the US and Canada. Cost: ~$3,600. Financed through Ford Credit at 0.0% for 24 months. Note: This only covers the Ford chassis, not
the entire motor home.
Tire Protection: No way on that one for me... Tires should be replaced every 5 years or so anyway, regardless of their mileage. On motor homes tires generally "age out", not "wear out". I can buy a new set of Michelin LTX's for around that cost through FMCA. More on FMCA later...
GAP Insurance: GAP is only needed if you are "upside down" financially on your RV. If you owe more than what the unit is valued at, for insurance purposes, in the event of a total loss you should consider GAP. We don't owe more than ours is worth so I don't carry GAP.
Roadside Assistance: You'll have Coach Net for free for the first year. My Ford ESP contract adds Roadside Assistance as well... Once again ESP only covers the Ford chassis, not "house" issues.
Also consider joining the Family Motor Coach Association
(FMCA) as you can get some really good coverage options through them at excellent prices. Their FMCAssist Medical Emergency and Travel Assistance Program is included
with your annual dues of $40 a year. The equivalent Good Sams policy was around $150 a year just for it...
Check around! And remember the devil is in the detail so make sure you are comparing "apples to apples" as coverage, and sneaky exemptions,
do vary widely!