Gordon,
A tip that Paul D suggested for helping to stop the brake pads falling off...
Most of us reverse the trailer into its parking spot at home, and back it upto the chocks so you don't need to put the handbrake on. The thinking being that leaving the handbrake off will stop the brake pad binding on (and then snapping off a week or so later when you next take the boat out).
However, apparently, reserving the trailer straight onto the chocks will still mean that the pads are slightly on (because off the anti-reverse mechanism I think).
So the tip is to reverse into the parking position and then move the trailer forward slightly to release the pads fully. Then put the chocks behnd the wheels and leave the handbrake off.
The other main reason for loosing your brake shoes is thought to be putting the trailer into water whilst the brakes are still hot. Indespension recommend that you wait 20 mins before putting the trailer into water.
Teaching to suck eggs again.