The two trikes I'm looking at are the Grand Tourismo 20, or the Rambler 30. I mainly ride on concrete trails and few occasions participate in over the road 20 - 40 mile bike ride events. I test rode a Rambler and like the solidness and the gearing. I have not been able to locate a grand tourismo locally yet. I would really like to test ride one before making the decision. My concern with the tourismo will it be fast enough being only 20 speed? I would like something faster option to keep up with the two wheelers on long rides. Also the rover creaks and moans at times I have to tighten the frame screws from time to time. Do the other trikes do this? Are the tube frames quite more so than the square frames? I'm a big guy so I need something to handle 275 lbs, 6' 4".