[Caymanboy]

I guess it depends on the boat and your preferences, in the olden days boats used to be winched up via the roller, nowadays with float ons that aft roller doesn't do anything till you are out of the water, I've seen many lesser boats hulls cave in because of too much pressure/stress on the hull bottom, the keel usually/should be much stronger for the weight, as far as the bow roller goes, usually want the bow eye to nestle up in under the bow chock, suposed to keep the bow from jumpin up n down. I beleive FR Frank has the specific specs for tongue weight.