They will hold fine...many under estimate the power of a 2x4 and if you feel weasy about it, you can browse the forums here and there is a formula actually showing how much it can hold. And with the extra 2x4 the way you did, like i did in my 180, it's actually a 4x4 with 2x4's, which is better than a 2x4 and actually provides less chance for twisting. Good luck on the rest of the build, working on my hood now