I am not trying to "stir the pot", but I will say that I feel for the problem that cdnrver is encountering. I can vouch that there is at least one more Heartland 2009 Sundance 2900MK out there somewhere, and it shows the exact severe rust issue that is indicated in the pictures posted by cdnrver.
Do a search on one of my initial posts, dated 9-28-2008, titled "Chassis corrosion on a new 2009 Sundance 2900MK".(sorry I don't know how to create a link)
I refused acceptance from the dealer because while conducting my PDI, I encountered severe rust and corrosion underneath, everywhere. The frame, the wheels, screw heads, bolt heads, slide mechanism, even the propane line. The dealer explained the rust because it had been a 'winter' delivery, and 'probably' encountered salt treated highways. He did not offer explanation why the coach had not been washed after delivery. The dealer came through for me however and delivered another 2900MK that was right off the line. But the corroded 2900MK is out there somewhere and I feel for that owner.
I offer this because it is certainly possible that the 2900MK that cdnrver purchased may have had the corrosion issue at delivery, and his storage and travels to Texas and other places had no fault to its present condition.
Thanks, my conscience is now clear.