While I would imagine most delivery guys are careful with the units they haul, they will most likely be doing interstate speeds, and the factory tires are simply not recommended for sustained runs at high speed.
If you are going to swap out the questionable factory tires anyway, as we did, it may not be that big of a concern.
We picked ours up at the dealer in Minneapolis, so it was delivered there, and it was in perfect shape.I hear most delivery guys will do a basic walk-through, but I wouldn't expect them to know everything, nor spend a pile of time doing it. They only make money while they are moving.
good luck!