I'm not impressed with Jayco's quality control either. Most new RV's these days have issues and you just hope yours aren't too bad. This is the right place place to either fix them yourself, or have the dealer or Jayco fix them if they are major. Eventually you will have a nice working rig! The good news is you will really get to know the mechanical parts of your Jayco!
My King Jack did not come with a signal meter. If yours has one, it would be in the head where you turn the antenna to point. Jayco told me they aren't putting them in anymore. Let me know if yours has one cause I'll be pissed.
Girard water heater - I'm replacing it with a conventional Atwood. We dry camp and wasting gallons of water trying to get hot water isn't an option for me.
The comments above about the bunk DVDs are correct. These only play DVD's or movies stored on a thumb drive in the correct format. There is RCA video and audio in jacks that tv could be piped in. I was considering a wireless transmitter for TV to them.
The rod in the shower is good for wet towels, otherwise its in the way. Mine needed another screw in the end that the pole lifts out from. It kept spinning and the pole would fall, (only one screw in the middle of the thing - duh).
I didn't need an alignment and no drive shaft vibrations, but I did need to raise my rear leveling jacks. They were installed too low.
I've added 400 watts solar, central vacuum, Progressive Industries Surge protector, on-board air compressor and rear air bags (mostly for extra clearance when needed), dimmer on the awning lights, Alcoa wheels, front TV power when driving mod, mount for Davis Instruments Vue weather station.
Next projects: Add a spare tire, replace water heater.
I've had my 2016 Greyhawk out on 4 trips, 2 of them dry camping and aside from the water heater, everything worked great.
Once you get the (hopefully minor) bugs worked out, it's a very nice rig!