Because we did not want to limit access to our front storage box or tow vehicle's rear hatch while towing, we were considering adding cross rails and bike racks to the roof of the T@G or the tow vehicle. But, instead, for roughly the same cost, we invested in two folding bikes from Zizzo. They weigh less than 30 lbs each and fold down to 31x27x12.5 and have carry bags. They fit easily inside the T@G or the back of our MINI, safe and secure. Now, I know this won't work for serious mountain bikers but since we just bike around the campgrounds and towns we visit and on improved trails, they work well for us. They ride so surprisingly well that we seldom use our conventional bikes at home anymore.