Biily, Congrats on your Gateway purchase.
We purchased a Gateway 3650BH just over a month ago and we absolutely love it. The only issues I have had with is so far are the LP gas auto changeover valve/switch, a water leak on the backside of the docking station on the black tank flush connector, and one of the glass covers for one of the LED lights fell and broke.
The LP gas auto changeover switch never does turn green to begin with when the gas it turned on, something both the dealer and I should have caught during the PDI. A simple fix of replacing the changover valve, but it'll have to wait until I take the rig back to the dealer for them to install a few IOU items in a few weeks. For now the gas is flowing just fine as is, and luckily since it's summer I barley use any gas, so no change of needing to change LP tanks in the middle of the night.
As for the leak on the backside of the black water flush connector inside the docking station, I noticed water dripping out of the bottom of the frame right there at the docking station when flushing out the front black water tank. I took the screws out and opened the side of the docking station and saw that there was a 90 degree connector right there for the back side of the black water flush connector. This 90 degree elbow was "kinked" off to the side pretty hard due to the rigidity of the PEX tubing coming out of the elbow. I zip tied the PEX tubing back towards the docking station, making the 90 degree elbow sit at 90 degrees like it should, and the leak stopped.
As for the screw-in glass cover for the LED light that broke, the dealer offered to replace the glass, no problem there. However the new glass falls out just as easy, leading me to think that the fixture itself is "stripped" out. I'll ask the dealer to replace the entire fixture when I take the unit in for the IOU items in a few weeks. However, I would suggest that you go around to all the light fixtures and make sure they are all hand tight so they don't wiggle themselves out and fall during your first tow. If they fall and hit a solid surface the glass covers will shatter and make quite a mess when they break.
If you have any questions about the 3650BH, feel free to ask. We've been out in her twice, so I guess I'm considered a seasoned veteran now.
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)