I'll second LJAZ
We pulled a '08 210WBS for about 50,000 miles before trading it in on our 5th wheel. Marvelous trailer. Just the perfect balance of living space and storage in a compact, well made, package.
The only place I ever had an issue on mine was the front window. Any trailer with a front window (any maker, any size) is susceptible to water incursion around the window. Pay attention to that area and look for evidence of water damage. I had a leak in mine, my fault for not noticing a small crack in the caulking, and I caught it in plenty of time, but, it will be an area that you cannot afford to ignore in your, minimally, annual, preferably 6 month, inspections of the seams and joints of your trailer. The front window was a huge selling point for us, but, that part of your trailer takes a lot of flexing and a lot of "water pressure" stress. If we hadn't "run out of space" (we are retired now and it was proving to be too small for 3-4 months on the road with three cats...the breaking point was when DW asked "do you think we can get a loom in here?"; she's a weaver...) we'd still be on the road with that little gem.
We towed with a Jeep Hemi Commander, Equal-i-zer WDH hitch and a Prodigy P3 brake controller. Rock steady, stable, started and stopped as well as you could want. Even with the Hemi, our lifetime mpg average for towing 11.23 mpg. Low point was 8.5 once in the Rockies on back roads, lots of grades exceeding 9% and slow going with switch backs. High was 12.9 mpg, coasting through Kansas with a tail wind
I'm guessing you can figure on the 10-11 mpg range. Some lower, some higher, but, on the whole, in that range.
Not buying from a dealer in PA are you?