i think spares right on with the salt issue. first boat i had was a 19 mako w/ a trailer that had 21 rollers. i could launch in a bird bath, but every year i was replacing rollers , brackets , axles, gang brackets, etc. after 3 years , i pulled all that off and put on two cypress bunks and only had wheel bearings to contend with.
no doubt a roller will do it all, but if local ramps will allow, i'll stick to bunks.
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