Bracing trailer underbelly

My coroplast has screws into the cross members of the frame keeping it well above the axles. If adding screws, be sure to look that the area is clear of potential screw damage.

Where was it fastened up to begin with? Mine, and most I've seen are held up with screws in the frame lip.

Can you see the tanks inside, to know that one did not drop down, pushing the coroplast down to the axles.

If all is well with the tanks, I'd run screws along the coroplast edge into the frame edge, keeping it like it originally was.

Without pictures, it is hard to offer opinions.

Jerry

It was not fastened with screws...just sagged over time I guess.

We pushed up on it and it is flexible...the tank did not drop onto it. There is no water in it making it bow.

Not being able to see in there...we just want to make sure we hit the frame with the screws...and we will get a metal brace to go across.

Thank you!

I would not be afraid to use screws in the frame, or cross braces like Wayne mentioned. The screws in mine have large washers to help hold as well.

Thanks for the pic, it shows that it is easy to see behind the coroplast, so obviously no tank dropped, or water damage.

A light piece of angle iron may help hold it up to an existing cross brace. Even an aluminum angle strip may be strong enough. In any case, adding a strip would cut down on the number of screws needed.

Jerry

That looks an awful lot like one of your holding tanks has broken loose and dropped down, or one of them has leaked and there is a lot of water sitting on top of the Coroplast.
For sure determine why the Coroplast dropped down before you do anything.

Hopefully not.
Good luck with it.

There is no brace across for about 7 feet of this section forward to back. Only screwed to the sides, not across the middle.

Someone on another forum has the same trailer and just emailed his picture. He has a cross brace 2' forward and 2' aft of his axles so we have a point in which to start feeling for the frame to screw in the brace.

It is definitely not a dropped tank or water. Just too heavy a section that finally warped over time and sagged.

We will get the aluminum strip.

Thanks everyone.

Yup I'd brace as mentioned. Or take a razor blade slice it open and see what's up. Black gorilla tape seals it up like new.

Get some uni strut and cross from I beam to I beam to hold it up

I welded 2" x 2" x 1/8" angle iron on the frame with some risers that lifted the angle iron up flush to the floor on a friend's trailer. Then again, I ised to be a professional welder with experience with welding trailer frames of all things.

Find a qualified local welder and you'll never have that problem of sagging coroplast again.