We have a Adventurous CS. With the second passenger seat and the rear couch we can seat 6 and sleep 3 with the front bed option. Though we only travel with the two of us. Pulling any sort of trailer is somewhat inconvenient if you want to stop someplace in town or even in some crowded rest stops. Once in a while we have been places where tourist traffic was rather horrendous and with a trailer or even with a wider RV than the sprinter would be problematic. We do really like the Roadtrek and in two years have traveled over 30K miles. Seating more than that really cuts down on interior utility - storage especially and as well placement and size of the fridge and microwave.
