If is delivered in Montana in December it should be winterized BEFORE delivery.
If not ask the dealer to do it with you watching BEFORE delivery.
Now: One thing about NEW RV's... Shortly after I took delivery I found that many RVers have a few seem to have a few screws loose (No not that kind) and more recently many RVs have a loose nut or two (Again not the one behind the wheel)
The story: My Air conditioenrs were acting upl. Sometimes one would work, sometimes the other, both or neither... Well I do not have an Energy Manger (Load shedder) so it was not that.
I opened the power distribution panel (Breaker box) and found that several of the screws inside were loose, also one of the screws securing a wire on my Shore power INLET was loose. I applied a #2 Square bit and a bit of elbow grease (one took a full 3 turns plus before it was tight) and have not had that problem since.
Another RVer had a brand new 5th wheel.... STICKER IN WINDOW new. 1st time out, and the shore cord outlet (the part that attches to the INLET on the RV) fell off in my hand.
The NUTS were on another forum member's RV, in the 12 volt system
Now.. All of these WERE properly tightened at the factory,,,, (Save for the shore cord outlet) but solid copper wire tends to :"Flatten": when used in RV's resulting in loose screws.. All you need is a #2 Square bit or #2 Phiullips (Square worked better for me) and you are good, oh Insulated screwdriver or better yet. PULL THE PLUG first.