Me too.
Well, not exactly a soft spot. Hull of my 6 year old CBL (epoxy-ply) slightly dished by the forward set of rollers, but this is a couple of mm movement after twelve thousand miles and more of pounding up and down Europe's toll roads. (Greece and back every year.) An extra keel roller up front to take the weight should solve the problem – if I ever get around to it. Either that or pack less gear!
A bigger problem with GRP, perhaps, as it is probably more affected by repeated flexing? (An engineer would know.)
Certainly, I don't consider it a big enough problem to swap to bunk bars from the excellent roller trailer she's on now.
Incidentally, fluky winds (and, it must be said, poor seamanship) caused a friend of mine to ram a wooden pontoon rather hard when coming alongside. Nasty splintering noise and crushed GRP - expensive repair needed. I tut-tutted smugly – until I did exactly the same thing 10 mins later and from the exact same cause (No. I was the more at fault having failed to learn by my friend's mistake!)
Insufferable smugness returned, however, as I simply bounced off with scuffed paint as the only damage. Good stuff, this 'poxy-ply, innit.