Battery Grounding in Truck Bed

Hello! I've been searching high and low for answers on this, but can't seem to find anything. I have a battery with inverter and solar setup in my camper shell, and I'm trying to figure out the best way to ground the negative terminal of the battery and the inverter post to the truck frame. My current thought it to run wire to the undercarriage of the truck, but I figure that will get incredibly dirty and stop working as intended fairly quickly. Has anyone gone through this before/have any ideas on the best approach? Thanks!

 

The bed bolts mount directly to the frame, I thought. You could attach your ground directly to that, instead of having to route all the way around/through the bed.

 

Ah, yeah, that's a great idea! I think I'll go with that, thanks @Rock Lobster!

 

Is it bad to have two different batteries or charging systems share a ground? Specifically the ECU and important electronics on the truck?

 

no. ground with is where current goes to die.