The main reason we went with a 5er was having a more separated bedroom and living area. If you're by yourself, that shouldn't be a big deal. You can tow a car with an A that you can get around very well with, while the truck you'll need for a 5er will be bigger and get potentially much poorer mileage. Maintenance costs of the truck will be much less than for an A though. I'd be hard pressed to make up my mind myself. I'd have to make a list of things I really wanted, things I'd like to have, and things I didn't want first. Then find a really big dealership or RV show and walk through a lot of them to get a feel for what's available.