We just towed our Suzuki Grand Vitara from Dallas to Mesa Verde. Most of the way we kept the speed at or just below 65 mph with no ill effects. Occassionally, on severe down-hill slopes we hit 70 mph with no ill effects. I think the 55 mph limit is because the steering wheel, and therefore the front wheels, is loose and can turn freely. The steering is fairly tight on our Grand Vitara and seems to "want" to maintain a straight course. The steering also seems to follow the turns of the RV fairly closely as we make the tight turns through gas stations. However, we have not driven, towing, over large holes and/or large obstacles which might turn the wheels and put a strain on the towing linkages. Also, at higher speeds I noticed that side winds seem to have a greater effect on the toad which translates to more RV steering corrections - not many, not much, but some. As for the 200 mile limit . . . we did not hold to that strictly. We were close, but not exact . . . maybe as far as 250 miles or as few as 180. I have come to believe that part of the reason for the 200 mile limit is not only to circulate the fluids but to be certain to keep the battery charged. I say this for two reasons. First, the key is in the "on" position which causes a slight battery drain. And second, I accidentally left the key in the ignition overnight which did indeed drain the battery low enough to need a jump. HOWEVER, all in all we were planning to stop every approximately 200 miles anyway to stretch, eat a meal, do the necessary stuff, etc . . . So, it has worked out just fine so far. Those folks that drive on and on forever without rest - stay off of my highway. I don't want to encounter your tired selves coming or going.