We're towing a 2013 22FBS with a 2014 Mercedes GL350 and Reece Dual Cam WDH. The MPG is good (about 15 towing) but I'm not happy with stability - lots of fishtailing. In fact I'm not happy with the suspension even when not towing - lots of wiggling, overly soft steering and hydroplaning on wet pavement (with brand new Michelin Premiums!). Have appointment with the dealer tomorrow to check the suspension. I think some of my fishtailing may be due to weight distribution on the trailer. I have extended the bumper and have mounted the spare tire, bike rack & 2 bikes and 4 Rubbermaid containers - totaling about 160 - 180 lbs. Am considering moving the spare to the front underneath compartment to take weight off the rear and put more weight on the tongue.
If the Mercedes people can't fix the suspension issues, I'm going to consider going to a truck (e.g., Ram 1500 Ecodiesel).
Any thoughts on any of the above would be appreciated.