It is very helpful to have your own hanging grooming table to go over a bunny with a potential buyer. There are grooming tables at the end of aisles personally owned by exhibitors, though everyone uses them. If the show tables are not in use, you can use those. Just remember when using the latter two choices, you are exposing your rabbits to everything and anything previous user's rabbits may have. If you can at least bring a small carpet to place over a grooming table for your rabbit's use, every little bit helps.
A carrier cart is a must have for convention. It is a long way from the unloading area to cooping.