LOW PROFILE - Rail on Rail Subframe F550

[PacificNorthWestJeeper]

I am moving on to the 'rail on rail' subframe part of my build on my 2017 F550.
The 2x5 or 3x5 ¼ wall tubing seems to be the standard for the rail on rail for commercial vehicles.
I am trying to save every vertical inch I can.
Has anyone seen/done a 2x2 ¼ wall subframe, but then weld the 2x2 side by side so therefore it makes in 4 inches wide by 2 inches tall?
I would cross-brace and gusset joints...
My thought is now you have 4 vertical walls that are a ¼ thick which, in theory, should easily handle the vertical torsion load????
If not other thoughts on low profile rail-on-rail setups? 2x3 welded side by side, or??????
Thoughts?
.

 

[gator70]

I am far in the subframe build. But your spec is different. Mine is 5 inch tall.

 

[PacificNorthWestJeeper]

GATOR 70: You do not want to use wood, here is a much better option:

PS-30 PermaSlat Mounting – McLellan Industries

www.mclellanindustries.com

Correct 5 inches is the mostly the standard as I stated above........... B U T who out there has made a low profile one successfully? Looking for any examples 3inch height or less. thank you for any leads on a LOW PROFILE subframe that truly works as intended.

 

[gator70]

GATOR 70: You do not want to use wood, here is a much better option:

PS-30 PermaSlat Mounting – McLellan Industries

www.mclellanindustries.com

Correct 5 inches is the mostly the standard as I stated above........... B U T who out there has made a low profile one successfully? Looking for any examples 3inch height or less. thank you for any leads on a LOW PROFILE subframe that truly works as intended.

GlobeTrekker has Ideas used in the new e-series subframe. The tubes seem smaller.