Picked up a running gear to put a LP tank on for filling up my tractor. Local coop is going to set up a tank for me and I will ask them too, but curious how others have mounted their mobile LP tanks to the running gears. I'm thinking of getting some 6x6 or 6x8 green treat lumber for the runners and placing 4x4s between above the axles, bolt runners to rear uprights and wrap chains over the front for flexibility...essentially a hayrack without the deck. Now, would I bolt the legs of the LP tank directly to the runners (or the stretchers if the runners are too far apart)? Or, bolt directly to the running gear and not have the ability to flex? Is there any need to ground the tank to the running gear? I'd appreciate any ideas, won't be running down the road much if at all with this setup but want to do it right the first time.