If I may jump in here and offer some information:
Fleetwood has some trouble as do many other RV (and car) companies. They did NOT move everything to Mexico, but have CLOSED the Mexico factory. I believe they will survive the bad economy. Even if they went under, you still can get it fixed, most all the systems, A/C, furnace, hot water heater, jacks, slides, refer, etc are all made by other compaines and are found in other RV's as well. If you really needed a Fleetwood part, there are RV salvage compaines that can supply used parts, do a google search for them. The chassis will be either a Ford or a Workhorse, both are good chassis.
The wandering issue: Have you ever driven a large MH before? A new driver often tends to oversteer and induce a wandering feeling. Drive the other MH and see if it feels the same way. If not, check in RV.Net and Irv2.com for help, there are solutions.
The extended warranty is not really a warranty, but a service contract that covers only specific items, not everything like a new MH warranty would. Remember a new MH warranty is only for about a year anyway. Service Contracts are very expensive and are very specific in what they do and do not cover, check RV.Net/Irv2.com for more info and then decide.
New MH's have intial teething problems that the warranty will cover. A used MH will have had most of those issues already solved by the previous owner.
Will the $10k extra for the new MH be worth it for the use you'll get out of it?
I have had 4 MH's, one used (20 years old) that was made by a company that went out of business. I was able to get everything I needed to keep it running. My last 3 I bought new and had many initial teething bugs that took alot of time to get fixed. That being said, I purchased a Service Contract on my newest MH, a diesel pusher, because of the extreme costs of repairing some diesel engine problems if they should arise. The contract costs me $3/month and is a premium coverage policy. My peace of mind.
Do your research, ask on the online RV forums, then get what is best for you. I'm sure you'll make the right choice and enjoy you RV greatly, especially at Fort Wilderness! The best campground anywhere!
Best Regards!