Congrats on your new Grand Design Reflection!!
Our new one that we ordered came in and they took a week with it and they only had a small down on it. We didn't stroke the check for it till we finished our PDI. The service shop was very busy and were delivering a couple of units most days. We are glad that they took this time and they showed us the checklist they used to go through the unit.
Ours was a 2018 Reflection also. Grand Design had quite a list that the dealer had to go through plus we had slide toppers to install plus install our Reese Elite Air Bourne Sidewinder pin box. I sure know I didn't want to try changing out myself. The thing weighs about 170#. I know when I put it together it was a job man handling the thing to install the turret on it and toque it to 250 lb ft. Then loosen it back up and torque back to 45 lb ft.
We are a little lucker than you as our dealer is only about an hour from us