Mounting bunks on angled cross member

[Rookie Boatman]

I am hoping to replace the rollers on my older (1990ish) homemade trailer with bunks for my Lund Rebel boat (aluminum hull, 16’ long, 6’ beam). I am up for the task of doing it myself - or at least thought I was until I realized my trailer cross members are not aligned.
The front cross member (middle of the trailer) is at the same height as the trailer frame itself, and goes straight across. The rear cross member (16” in front of the boat transom) starts lower down and angles 10 degrees downward, only flattening in the middle a short distance before rising to the other side. I have attached a few pictures that I hope make this clearer.
Essentially I have a front cross member that is flat and has 2.5” of space under the boat hull, and a rear cross member that is angled with 8” of space under the hull. I can figure out the front mount easily enough, but is there a way to mount a bunk on the rear angled cross member? I know there are angled bunk mounts, but as I understand it they are meant for flat cross members and angled hulls - not the other way around! I estimate that at 10 degrees angled over 8”, the brace would lean an inch or so inwards - which could bend (or collapse) over time.
I would greatly appreciate any advice on how to approach this. Ultimately if I need a pro to weld the rear bracket straight upwards I can do that, but any ideas for a DIY solution would be welcome!

 

[briangcc]

Bolster Brackets (Tiedown Engineering)

The Tie Down Bolster & Bunk Brackets are designed to provide solid support to your boat’s bunk boards or bolsters. They feature slotted design for vertical adjustment, along with non-slip dimples to restrict movement and offer increased load capacity. The bracket comes in varying sizes for use...

www.iboats.com

Look at option 81210 which has a swivel head to compensate for the tilt of your rear cross member. Go bigger if needed. Easy, peasy.

 

[Grub54891]

I've been thinking of replacing my rollers with bunks. 17.5 larson. But as I look at the rollers, I could take them off the brackets, and install bunks on the spots where the rollers were attached. The arms swivel so I think they would offer even support. Maby I'm wrong.....lol

 

[Rookie Boatman]

Bolster Brackets (Tiedown Engineering)

The Tie Down Bolster & Bunk Brackets are designed to provide solid support to your boat’s bunk boards or bolsters. They feature slotted design for vertical adjustment, along with non-slip dimples to restrict movement and offer increased load capacity. The bracket comes in varying sizes for use...

www.iboats.com

Look at option 81210 which has a swivel head to compensate for the tilt of your rear cross member. Go bigger if needed. Easy, peasy.

Thanks! I ended up using those in the back where the rollers were and they seem to work nicely. I was worried about them being at an angle but they are very solid and should hold strong.
In the front I mounted the bunks directly to the cross brace, as the space is much smaller. Angle is good and loading seems to work well.
Thanks again!

 

[Grub54891]

Any pics?

 

[Rookie Boatman]

Any pics?

Yes, here is the front and back. Need to tighten up the back ones a bit more - some brutal washboards on the way to the launch pushed once side down a bit - but it worked out nicely.