When we first got the Roadtrek nearly 6 years ago, we almost bought the attachable screenhouse for it (awning mount). After reading about what a PITA they are to put on and off all the time we decided to pass and get a standalone screenhouse. We settled on a 9.5' X 13.5' Eureka that would fit over a picnic table, as that sounded like a good idea. As it turned out, until our last trip we were never in one place long enough to justify setting it up. We quickly discovered that we didn't like it over the picnic table as it was crowded and no room for chairs, plus we use the picnic table for the grill on a propane hose so it had to be within 15" of the rear of the van. It worked fine once we moved it off the table, but it was large and a bit hard to find a good spot on our site. It had much more room inside than we needed for our two chairs and little table, but it was hard to use because the only guy line was inside from the peak to the ground with none outside. We decided to sell the Eureka and get a smaller one, to save the storage space and make getting a good area to set it up easier, but that is easier said than done, as there are very few smaller ones that aren't the tiny beach hut types. We finally decided on the this one. We hung a sign on the old one while in the campground and sold it there before we left.
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
Set it up yesterday in the yard as a test, and it was very easy. Plusses were the fiberglass top poles, metal stakes, and external guy cords with quick tensioners. It is very small when rolled up. They don't show it on the manufacturer site, so it may be discontinued, or it could be because it appears the company changed ownership. Looks to be just right for a B.