len19070 wrote:angib wrote:The Carry-On trailer from Tractor Supply is the one that has caused problems with weak tongue mounts to one or two forum members - the tongue itself is strong enough but the two angle cross-members it's bolted to are too close together and they can be bent by high tongue loads - in one case by the builder standing on the tongue.
Andrew
Andrew is correct.
I generally correct this problem by doing 2 things.
First is I install 2 angle iron struts from the 2 outside rails just behind where the second cross member begins and run it up to the 2X2 square stock, these can be bolted and I usually use "Bed Rail"
This shortens the unsupported span on the second cross member by about a foot.
It makes the tongue look like a "Peace Sign".
Then when I build the platform I make sure that there is a full 2X4 on the flat directly over the 1st and 2ed metal cross member.
And that these 2X4s are bolted (5 each) to the cross members.
Then just "because" when building the box the first front rafter that attaches to the deck is a full 2X4.
The problem is at the second Cross member. By installing the Bed Rail it decreases the cross members span from 4' to 3' and with 4 mounts (2 factory welds and your 2 bolts) instead of just the 2 welds.
Make sure that the 2ed cross member is reinforced. Even another piece of bed rail underneath wouldn't hurt.
And don't jump on it until it is!Crude drawing, red dots = bolts

Happy Trails
Len
Len,I dropped by the Tractor Supply near my house today to look at the "floorless" 4x8 trailer on the lot, and I couldn't visualize how you did it. I came away slight puzzled.
The perimeter of this frame (side rails and first and last cross members) is angle iron with the angle pointing up, and the cross members (except the first and last, which are part of what I called the "perimeter" above") are all angle iron with the angle pointing down, welded underneath the side rails.
It was easy enough to see how your "bed rail" would run from the square tongue back under the first cross member (angle iron pointing up), where it is bolted, and how it would run to the side rails (angle iron pointing up), where it is bolted. But because the second cross member is angle iron pointing down, you would either have to cut the cross member to allow the bed rail to run through, or cut the bed rail. I was also wondering how the bed rail was bolted to the tongue - I guess you must bend the bed rail to the proper angle (cutting a notch?).