I've been planning on extending it for years. I had a really slick layout in cad for a 2 person setup and then we had a (very much desired, but didn't think it was going to happen) child and 3 people and 2 whippets don't really fit too well.
I'm still trying to work out what to do. The medics seat frame is still in mine so I may rearrange my plans and take out the middle of the bulkhead such as there's a child's seat there, but I'm still not convinced it will work.
The other option that I've been considering recently is just taking the 110 also. It's not like we would be going far anyway, and my fuel is cheap enough, and it's nice to have a car to drive when you're "there" anyway.
Our 101 is LHD. Which is drivable here but it's not the most pleasant. I never thought it was so bad until I drove it on the mainland and all the roundabouts are suddenly the right way (etc).
But, yeah, your question - standard extension at the back and side door.
The barn doors are kind of nice if you're staying in the middle of nowhere but it's rare that happens. They're a bit exposing if theres other people about and flipping the step bit (even if you lighten it) up and down all the time does get tedious.