Bedframe coming apart

Well, had the frame stripped down by removing the large plywood sheets the mattress goes on. Also removed the bottom of the so called storage compartment so could observe the action of the frame as slide moved in and out. Before moving the slide, placed some small L brackets to the corners of the wood frame that were loose in places. I wanted to observe the movement of the frame before attaching the bed frame head area to the slide floor. Good thing I did that as the top of the slide "flopped" in just before the end of the closing cycle. The entire slide including the floor, sides and roof moved as one. It probably moved in at the top at least a foot. As the slide moved out the top tilted back toward the outside but appeared to seal properly. Concerned about what would happen to the bottom of the bed frame toward the head of the bed if it was attached to the slide floor. This flopping causes the frame and the back slide wall to be stressed and there is flex between them. The bed frame flexes as the back slide wall moves as the top of the slide flops. I can't find any loose bolts at the back of the slide where the hydraulics are attached to the slide floor. The slide seems to teetering toward the outside until the slide's weight causes it to tilt to the inside and the reverse on the way out. Also, think there has to be some rollers under the slide floor but not sure what kind. Not that the rollers are a problem. I appear to have a more serious problem and one that is beyond my abilities or patience. I had the dealer fix this flopping months ago not realizing what stress this was causing with the bedframe. The dealer tech said he knew what was wrong and took his tools and said it was fixed in about 15 minutes. Anyone have any input as to what the problem is?