1. Please join your fellow forum members on our new Facebook Group. https://www.facebook.com/groups/247355990036949
  2. Just a quick reminder to keep politics off CSR. It is a volatile time, there are a million places online to discuss politics, CSR is not one of them. Thanks everyone!

Trailer bunk adjustment

Discussion in 'Trailering' started by HawkX66, Jan 10, 2021.

  1. HawkX66

    HawkX66 Active Member

    348
    Jul 27, 2020
    SE Virginia and Mass
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    When I bought my trailer it was fitted to a 2006 290DA. My boat is a 97 290DA. It seems to be really close, but the bunks are currently sitting on the OE through hull transducer and the water ports. I'm not worried about the transducer because I don't use it.
    My question is whether it's ok to just move the rear of the bunks out a couple inches or should I move them out equally? This would make the bunks a little bit of a V. If outboard isn't enough, how far in is safe?
    Here is what it looks like right now.

    IMG_20210109_150223.jpg IMG_20210109_150121.jpg IMG_20210109_150142.jpg IMG_20210109_150127.jpg
     
  2. Chip S

    Chip S Active Member

    248
    Jun 17, 2019
    Bordentown, NJ
    1993 Sea Ray 200 Overnighter
    1993 Mercury 150 hp Black Max Outboard
    If you move the rear bunks out the boat will sit lower on the trailer. If you have enough clearance between the boat and the trailer, I would move all of the bunks out to keep the boat sitting level.
     
  3. HawkX66

    HawkX66 Active Member

    348
    Jul 27, 2020
    SE Virginia and Mass
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    I'd rather go outboard, but I'm not sure if it'll move far enough over and I'm not sure if the keel will have enough clearance to the cross bar. I guess at this point I'll just have to move it and see.
     
  4. dvx216

    dvx216 Well-Known Member SILVER Sponsor

    Feb 1, 2012
    Catawaba Island,Oh.
    2000 310 sundancer 5.7
    optional electronic package






















    n/a
    twin 5.7 300 Hp.
    You should keep your bunks parallel to the center line of the hull considering you trailer doesn't have a bunk for supporting the center to carry the weight. Any angle would cause the weight of the boat to push sideways on the bunks and will cause the boat to sit not parallel to the trailer and who knows how it would effect loading and unloading . Considering how your trailer is setup to move them outside of the ports would drop the boat down on top of the axles. If you make some taller bunk boards you could move them out . If you have a custom trailer shop in your area take it to them and see what they think. Another possibility would be to install brass ports then if you did slide up on them you wouldn't break them.
     
  5. HawkX66

    HawkX66 Active Member

    348
    Jul 27, 2020
    SE Virginia and Mass
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    Thanks. They're already brass. I felt like parallel was the right thing to do. Thanks for confirming. I'm not sure it would come to the point of dropping the keel on the axles if I move outboard. The axles are the same height as the dropped cross bars.

    IMG_20200729_131741.jpg
     
  6. 2016FLD

    2016FLD Active Member

    134
    Apr 3, 2020
    Tarpon Springs, FL
    1985 Sea Ray 260 Sundancer
    5.7 Mercruiser
    I have a similar set up, moved rear bunks out evenly (front and back ends) and it worked well. Personally, I would not have it sitting on that brass water inlet, that places an extreme amount of weight in a small area, when towing and the weight of the boat is bouncing, could lead damage. If clearance is an issue, you could switch to taller bunks.
     
  7. HawkX66

    HawkX66 Active Member

    348
    Jul 27, 2020
    SE Virginia and Mass
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    I agree. I don't want to sit on the inlets. At minimum it can damage the bunks. At worst it could put too much stress on the hull in one spot like you said. I'll go out today and see if I can adjust it without taking the boat off the trailer.
     
  8. Thornton69

    Thornton69 Active Member

    635
    Sep 15, 2014
    Northern BC
    1981 245 SDC
    2020 Solar 420
    '97 5.7 Bravo 2
    '20 Merc 25 EFI Jet
    The bunks themselves do not have to sit on the crossmembers. They usually have several holes in the angle brackets for raising them. Spreading and raising them may be the way to go. When setting up ours, we set the bunks on bolts in the lowest hole and drilled/bolted the bunks in place in the top ones.
     
  9. HawkX66

    HawkX66 Active Member

    348
    Jul 27, 2020
    SE Virginia and Mass
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    I think there is plenty of adjustment available if it comes to that. I'd like to keep the center of gravity as low as possible though, so hopefully I can just move them outboard without having to adjust the bunk height.

    IMG_20210110_112544_1.jpg
     
  10. Woody

    Woody Well-Known Member

    Nov 20, 2007
    N. Wisconsin/Lk Superior
    2005 420DA
    Cummins 6CTA8.3
    Going by the pics I think I'd move the bunks out and raise them up to the top bolt hole in the brackets. This maintains about the same clearances and fit of the front centering bunks too.
     
    HawkX66 likes this.
  11. dvx216

    dvx216 Well-Known Member SILVER Sponsor

    Feb 1, 2012
    Catawaba Island,Oh.
    2000 310 sundancer 5.7
    optional electronic package






















    n/a
    twin 5.7 300 Hp.
    Never had a trailer that didn't have center support to bear the weight and the outer bunks for stability.
     
  12. HawkX66

    HawkX66 Active Member

    348
    Jul 27, 2020
    SE Virginia and Mass
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    I haven't seen a bunk trailer for a boat this large with center supports. Were the trailers you had for your current 310 or one similar in size?
     
  13. dvx216

    dvx216 Well-Known Member SILVER Sponsor

    Feb 1, 2012
    Catawaba Island,Oh.
    2000 310 sundancer 5.7
    optional electronic package






















    n/a
    twin 5.7 300 Hp.
    A local custom trailer Co. built it for my boat IMG_20170923_161419280.jpg
     
    HawkX66 likes this.
  14. Blueone

    Blueone Well-Known Member SILVER Sponsor

    Jan 24, 2007
    Lake Erie, Ohio
    2004 420 Sundancer
    Cummins 6CTA 450's
    I have had a roller in the center for loading on shallow ramps so you didnt hit the cross members but it never touched the keel once loaded...this was up to 26'
     
    HawkX66 likes this.
  15. Sundancer

    Sundancer Well-Known Member

    Jul 20, 2005
    Prosser, WA
    32 year old CLASSIC 300 DA, towed almost anywhere behind the Duramax Duallie Crew Cab.
    16 cyl, 700 cu. in./Alpha I's
    You could just make a notch in the bunk where the water inlet is. Give yourself an inch or two for leeway. It won't hurt anything and might be easier.
     

Share This Page

Show Sidebar