Reefer floor repair

Get some good aluminum plate and plate the cracked section. Fasten with 1/4" aluminum rivets. That insulation burns good

 

On second thought I would do what the other guy said. Use some fastener screws and screw down some 1/8 inch thick steel

 

It cracks because the stringers are bad. Could have wood or plastic stringers. You can screw the floor down tight to cure it for a short time if the stringers are plastic. If they're wood it won't last as long.

Doesn't matter if the tandems are slid back or not.

 

You can replace the stringers without cutting the slider rails loose. PITA but if it's just the first 4-5 feet just replace the center section, that's where the forklift hits hard going in.

You can't rivet a plate on, it'll just break loose. Couple thousand to weld/plate 4-5' the right way that will last years.

 

That is the deal though. You have to consider the severity of the crack as well. Heavy loads can completely open up the floor. You really have to fix them good.