Long time lurker, and finally built a modified widget (pictures coming shortly), that I am now remodeling. Besides a series of internal changes to accomodate two adults + two children, and adding a potty-room (it's going to be a tight squeeze in there), I'm also changing from leaf springs to a Flexiride axle. I already have the axle, but my main question is do you guys think directly bolting to the 1/8" thick main rails will be study enough? There's an image below of my current setup. It's an old pop-up frame axle. In a nutshell, the main rails are composed of two 1/8" C-channels where one has been placed inside the other with open sides facing, thus making a tube. The picture below will hopefully make that more clear - I drew some circles where the two mouting holes per side would go for the flexiride. Do you guys think I need to beef up the attachment point for the Flexiride to something thicker than 1/8"? In essence, the two vertical faces are 1/4" thick since the one smaller C-Channel is welded inside the larger one (each one has 1/8" walls). I was going to use really big washers to spread out the load. My widget weighs around 1400 # so I'm using a 2k Flexiride.
Thanks!