I purchased from Des Moines RV and was very frustrated with them during the time between order and delivery. They promised weekly updates that never happened. Found out later that our salesperson had a family emergency and no one was willing to make the calls for him. If you buy off the lot, this shouldn't be an issue for you. If you want to order a new unit, just be ready to make some calls yourself.
When I picked the unit up, the service manager told me I didn't need any type of sway control (the 338RETS is nearly 40' long and I'm pulling with a F250). I finally talked them into selling me the Dual Cam system that I requested. Then they didn't install the snap-up brackets correctly and by the time I got home they were hopelessly bent. I took the brackets back to the service department and all the Service Manager could say was "yep, that'll happen". I did get their corporate office to agree to reimburse me for the new brackets but I haven't seen payment yet.
I haven't tried to get any warranty work done yet but I do have some I need to get completed. I've heard both good and bad about their service department but based on my past experience with them, I'm not eager to hand them my trailer. Ketelsen RV, the Jayco dealer in the Cedar Rapids area, is building a location out by Desoto. I may wait until spring to see if they will be able to do Jayco warranty work.
All that being said, they did give me a great deal so I'm willing to overlook some of the frustration. Depending on the unit you are wanting, I don't think 30% off MSRP is too much to expect.