Congratulations on your trip!
You may be the wandering sort, or like to have everything planned ahead. Either way,
buy the Woodall's Campground Directory for the part of the country you plan to visit.
If you like to wander, just keep it with you in your tow vehicle! They make several editions, some have overlapping geographic areas.
As far as the flaps go, since you're talking about the bed end, that'll be the same as our 2720. That said... :-/
what flaps?
There are some seals around the queen bed slide on our trailer, but they aren't movable.