Finding good ground under bed

I have wired up my bed mounted light bar on my 2013 access cab up to the point where the last step is to ground out a relay.. This grounding wire ends up near the front of the driver's side leaf spring and one of the fuel tank securing straps. There really aren't any good spots on the frame close by that I can see, but I need to know if anyone else knows of any. I would prefer not to splice yet another wire into this mess.

Thanks

 

On the frame by the top of the rear shock is on. You can see it if you look into the fender well above the top of the tire on the frame

 

Well I was hoping not to add more wires in but that actually will work pretty well. I can't believe I never noticed that big cluater of grounds before.

 

yup driver side top of frame by the rear tire. Thats where i pulled a big ground from on my truck.

 

The entire frame is a huge ground. You can ground the circuit on any bolt or screw that is screwed into the frame as long as you clean it first.