hard to get a picture under there, but my Lippert frame under my funfinder by cruiser has rolled I-beams.
This frame also has gussets in places where it should have such as where the shackle perches are welded on etc. Has out-riggers no more that 24" apart and some as close as 18".
I'm no engineer but I have stuck a few pieces of metal together with a welder over the years, and it looks ok to me. Six years old now, still rolls down the road the way it's supposed to.
I'm neither a fan of nor a detractor of LCI. To me it's just another supplier of stuff. As another poster pointed out, if you are gonna avoid LCI stuff, you probably won't be buying a RV in the USA.
EDIT" 6" beam, 1/8" thick
