How stout is the frame or structure for the bimini top? Is there any wiggling or rattling at 35mph when you're on the water? If there is then it'll likely be considerably worse at 55mph on the road. 4 boats ago my parents had an Arima with a bimini top and we didn't want to chance ruining anything so we'd always put it down when cruising or trailering it so that it wouldn't damage anything. Because like PointedRose mentioned, it's quite expensive stuff to buy and/or replace. Thankfully the last 3 boats that I've owned all had a hardtop or skip top to them and rarely ever used the canvas/isinglass inserts because the majority of the time we use boats would be during the summer when it's hot. That being said, I did trailer my 228 Seafarer from Maryland back to Seattle and along the way both radio speakers attached to the hardtop fell off and into the cockpit of the boat. I know it's not an apples to oranges comparison comparing a speaker bracket to a bimini top support, but I suppose just about anything is possible. And while it might not break, the bimini top support could potentially get really bent.