overkillFFF
+1y
Well think about this...you want to use 2X2 so it will conform and curve with the frame. What do you think it will do when the stress of going over bums and dips while driving with a 200lb plus box bolted to the frame. In my opinion, you should never use square tubing for a frame because it is more likely to "bow" vertically, rather than side to side. That's why you need 2X4 or piece together like the guys said with an 8 piece notch. This is not the point on working on a truck where you want to be lazy!