"Please list any positive or negative issues traveling with large dogs."
Under 45lbs is not a dog. It's just an over-sized cat.
"You may encounter some campgrounds that restrict certain breeds or have a size/weight limit for dogs."
Over the years the definition of "bad-ass" dogs has changed. When I was a kid, it was German Shepherds, then dobermans, rottweilers for a while, now pit-bulls. The ones that annoy me in the campgrounds are the ankle nippers (always 3 or 4 with one person) yipping constantly at anything from another dog to a blowing leaf.
Personally, I never liked pit bulls, but my daughter has had two. Both big babies and very friendly. Never any aggression. Would I get one? No. Don't like airedales either. Love Huskies, even though they are tough to train. The best dog I ever had was a shepherd/husky.
We don't have a dog now because we travel too much. But when we are more home bodies, it's on the list.