Bunk trailer for Osprey 175

[doyle007]

I am going to convert my roller trailer to a bunk trailer for my 175.  The boat will only be on the trailer for three months, and then back in the water for the other nine months of the year. My total distance to move the boat from the ramp to the storage spot is about ten miles round trip, so that is only twenty miles per year to put on the trailer.

Does anyone with a 175 have the spacing between their bunks? I have been reading through all of the roller to bunk conversion threads, and I see that the bunks should be placed right under the stringers. Since I do not have an access point to give me good access to measure this, I am hoping that someone else already has this measurement so that I can just go ahead and mount my bunks.

Lastly, how important is a carpeted bunk? I am going with two 2x6”s per side so that I have a 3” surface for the top of the bunk, and was not going to bother with carpet or slik strips. Any issue with this?

Thanks all.

[RickK]

Where you live you have pretty decent tide swings and the ramps are not gently sloped and this combination is what the roller trailer was designed for.  The bunk trailer was more designed for a gentle sloping ramp and the trailers are usually much longer than they need to be to keep the pull vehicle out of the water.
If you have access to the boat open the access plate to the bilge pump, your stringers are right there and you can measure between them. Guessing, I would say the stringer center will be about 18" from center on each side. (6'9" beam/2 = 3'4.5" width per side and the stringer is centered in the middle of that width)

[wingtime]

As light as a 175 is I wouldn't hesitate to go to a bunk trailer.  The stringers are wide on an Aquasport  I'd say about 60%-75% of the way from the keel to the chine will get you in a good spot.  Remember the closer the bunks the higher the boat will sit on the trailer an out of the water... so I'd get them pretty wide.  Make sure the bottom edge of the transom is sitting on the bunks.  you don't want the aft end of the bunk fwd of the transom.  If it does you can get a hook in the hull.

[doyle007]

Thanks guys for your input.  I greatly appreciate it.

[Kpierce67]

Wing time, so the boat shouldn't be past the end of the bunks?

[mshugg]

Wing time, so the boat shouldn't be past the end of the bunks?

That's correct.  The bunks can extend a bit past the transom as long as there are to tabs or transducers in the way.    But if the weight of the motor and transom isn't well supported, the hull can develop a hook.