Welcome to JOF
I'm sure your new 154BH will be a great unit....., just insure you are provided a detailed PDI..., but feel free to report back here with any questions/comments that you might have at any time.
Review the above document and select the items that may be applicable to 154BH PDI. I would advise your RV dealer to allow time for a detailed PDI, and if the weather isn't conducive for an outdoor PDI, see if the they would be kind enough to bring the 154BH indoors (or postpone the PDI).
Just food for thought.