i've tied down 2 and even 3 dirtbikes with mine and yes, it can flex a little. i added a third hook of my own in the center, which i backed with 1/4" of steel about 9 inches by 4 inches on the back side. it works pretty well. i put a canopy on and got a trailer now but, it worked really well for months and months. just whatever you do, don't use those sliding red rail cleat things.... i would suggest adding hooks to the front on the floor with the bed bolts and adding a center hook backed with steel.