We sold our 2005 Grand Junction 35TMS last April and bought a MH. We bought the GJ new in April 2005. The only problems we ever had were; a water leak 2 weeks after purchase. The dealer use the SealTech system
to locate the source of the leak (above the entry door), water seen inside was at the RR corner under the window, that was 20' distance between entry point and visible inside. It had 2 heat pumps and 2 Dimplex fireplaces to keep it toasty warm in sub-freezing weather, and of course the LP furnace for keeping the holding tanks from freezing when temps got down to the teens.
In 2008, the driver-side slide mechanism sheared the er, shear pin. I replaced it myself, and enroute home stopped in at the Dutchmen factory service center in Goshen, IN., and asked them to inspect the mechanism for the reason the pin sheared. Took them about 10 minutes to report one end of the mechanism was bent, and appeared to have been that way since assembly. Took them about 2 hours to replace everything. I think the repair bill was around $200. Great place to do business; contact is Dan Beer, service manager. I discarded his phone # when we sold the 5er.
The few other problems we had were wear N tear related to the undercarriage and tires. Replaced the MorRyde RE suspension in 2010, it was worn out. Replaced the tires with Sailun 235/85R16, load range G tires
in 2010. BTW, the Sailun's replaced the 2nd set of ST tires, which all 4 failed(no blowouts) at once - ply separation.