We had an Aspen Sentry back when we had our 2010 RT. It towed great. Once you get used to setting it up, it doesnt take but 5 minutes to complete. Of course, tear down/packing up takes much longer. We really enjoyed it.
One thing I did discover:
Make sure to check the hinge bolts for tightness. If one of these bolts comes out, you are in for one helluva fight getting it back together. Ours came out while at a campground in Montana. I bought a temporary replacement from True Value, but getting that bolt back in with all the plastic washers in the correct place was a nightmare! I lost a thumbnail trying to align it up. Fellow campers thought I was a nutcase!

. I called the company and they sent me a whole hinge set for the one side. After I got home, I took out the old bolt and installed the new one from the factory. THAT took another hour of fiddling around, but I did get to keep all of my fingernails!