While we're not exactly solo as its me and my girlfriend, we take our two yellow labs pretty much everywhere with us. I can't say they really have ever stopped us from doing any activity, but we like to include our dogs in the things we do so that may cause us to pick things to do that we can include them with.
They're extremely well behaved dogs who that rarely ever bark, they don't chew and are really good at holding 'it' in for hours and hours, because I swear for water dogs, these two act like they will melt in the rain.
Leaving them in the camper when we go out motorcycle riding, or even in the truck if we stop for dinner has never been a problem. We usually travel in cooler areas, but if I thought it were even questionably too hot for them I would leave the truck running with the AC on for them.
I would look for a breed that is more of a calm laid back breed if you're still in the looking mode. I've had smaller dogs, and dog sat for people with smaller dogs and I find the bigger dogs to be much lower maintenance and easier to manage.