We just picked up our new T21QBHW on Wednesday. The PDI took just over two hours, including a test drive, and the Tech went over all the systems with my wife and I. We also checked the overall fit and finish of the trailer's paint and decals as well as the appliances. The only real issue we found was a thread pull in a curtain that was replaced on the spot.
Tips? Beyond the checklists here there are a couple things I'd add:
Have the Tech show you how to winterize the water system and what you need to do to de-winterize it this spring. Make sure you know where the "low point drains" are located and any cutoff valves for them. Depending on your location have the unit winterized before taking it home.
Heating and Cooling:
The order you check the A/C and Heating systems depending on the outside temperature. If it is warm out check the CoolCat A/C first to cool down the trailer for testing the CoolCat's heat pump and the furnace. If it is cool out run the furnace and CoolCat's heat pump first to warm up your trailer before checking the CoolCat's A/C.
Wheels and Tires:
Have the Tech show you where the jack points are to change a tire. Confirm your
jack and lug wrench will fit the unit. Note: Your trailer comes with a spare tire but no
tools to install it.
Also confirm the wheel lug nuts are torqued correctly and the tires are at the right air pressure.
Have the Tech show you the location of any inline
fuses that are installed in you unit. The Power Inverter does not
contain all of the fuses. I have three inline fuses in addition to those located in the inverter. Knowing about these fuses now will save you trying to figure it out later.
Make sure you understand how to use, and properly adjust, any Weight Distributing Hitches (WDH) and or sway controls. How many links did the Tech say I should use? I'd write that number down in my Owners Manual!
I hope this helps. Enjoy your new trailer!