Hello jimnsue ,
Absolutely get the frame kit from airstream .A crack like that even when welded will crack right down the weld or most likely next to it .You can't just run a bead of weld on a frame .There are specific procedures to adhere to
when repairing a crack ,especially one that runs verticle as that crack does .
The weight of your coach has caused that crack as well as impact from
worn axles bottoming out ,you can see it is wider at the top as if the frame
is pulling it open ,and it is .The doubler kit will reinforce the frame front to
rear spreading the load .There will not be stress then at that crack point.
the frame is bent at that point ,so raising the rear of the trailer up to unload
that stressed area and having the frame reinforced is critical .When you raise
the rear up it will cause the frame to try to bend back up straight .Any way
long post ,but take this seriousely its a problem .
Scott of scottanlily