Originally Posted by Little city
Been busy since last time. Floor off our 79 argosy. My iigquestion is. At the bathroom end. The frame looks like has been cut it’s doesn’t feel like there enough metal there. If you stand on the frame it sinks down. Is this normal? Let me try with a picture.
If the frame moves independently of the shell It sounds like what you have is commonly called "REAR END SEPARATION". Very common on older AS.
If you replace the piece of plywood you cut out (your photo), without removing and replacing the entire piece under the "C-CHANNEL" you will have significant problems with frame separation going forward. Most people use the old sub-floor as a template. Once the entire piece has been removed.
You need to understand the way your trailer is built. It starts on the ground. The tires support the axle(s). The axle(s) support the frame. The frame and outriggers supports the plywood sub-floor. The sub-floor alone supports the shell via the "C-Channel".
So if you do not replace the plywood under the c-channel as one piece across the frame to the edges of the skin you have defeated the engineered supporting of the skin and will allow the frame to move independent of the shell. No bueno.
Check out the foto's and diagrams in these threads.
Hope that helps.