New to the boating world but not trailers. My trailer has rollers and I'm wondering should the arms on which the rollers are mounted, be able to pivot left and right or should they remain static in the shape of the boats hull?
Roller trailers generally have roller arms that pivot right left and the rollers themselves are called "wobble rollers" for a reason. They Wobble so they can contact the boat properly. If the arms don't pivot then the rollers can't conform to the hull.
Sounds like they may have siezed up on you. Time to get the penetrating oil and a little persuasion to get them moving again.
Photo of the trailer and rollers would help though.