Yeah, there's another thread on here about positioning the L brackets on the new Vibes. You definitely don't want them too far back but you don't want them too far forward either. I called Equalizer about this because, with the position of the LP Gas platform, I could not get the L brackets in the specified range of positions. Equalizer said that they do not recommend moving the brackets farther forward than the manual says because it puts extra stress on the bars and hitch.
I, and a few others, ended up raising the LP bottle platform so that I could position the L brackets in the correct spot per the Equalizer manual. Some guys re-welded the platform but I just put some pressure treated wood across the frame to support the platform. I can post some pictures if you are interested.
2015 268RKS Vibe Xtreme Lite
2012 F-150 EcoSCREW Max Tow