Double rollers are by far the slickest way to load and off load your boat from your trailer.
This design features a cantilever pivoting system, so when your boat is off the trailer they automatically tilt downward making it easier to glide your boat back on at the end of the day. The smooth action of the rollers allows single handed loading of the boat.
Double rollers also distribute the weight of your boat across a wider section of your hulls, protecting the fiberglass from soft spots.
Retro fit kit can extend the width of your trailer to accomodate wider boats if needed. The rollers simply bolt on to your existing cross arms.