Time to chime in on fifth wheel frames and I beams. 10" vs" 12" I beams? There is a lot of misconceptions on how the I beams are constructed. Most Fifth wheel I beams are not a one piece extruded I beam, they are a welded I bean with the flange top and bottom.
You have to look closely to tell the difference. Most all the frames are made by Lippert, they produce "Stock Frames" for F/W manufacturers. Stock frames are welded I beams, not a 1 piece extruded I beam. Jayco doesn't use "Stock Frames" from Lippert, however they spec a frame and Lippert builds it. Jayco uses a true I beam on all their products.
2015 F-450 XLT 440 HP Power Stroke 26.5K Custom Resse F/W, Manual Regen, 19.5 Rubber
2014 Oreion Sand Reeper 4x4 Toy steel everywhere, street legal and licensed, 5 speed manual, 3 cylinder DOHC "Chery" engine and 2 door fun.
2015 Jayco Sesimic 4212 Extreme Weather Package, Dual Pane Windows, Side and rear Patios, 480 watt Zamp Solar Pkg 6 AGM batteries, Residential Fridge, custom Dishwasher, 5500 watt Onan and lot of problems.