ok guys i just bought a tank like the one linked and know i want to get ideas how to secure it best to the truck. it has three flanges one on each side and one in the front. a ideas or suggestions

 

i think most guys just bolt it to the sheet metal in the bed.

 

Bolt it down to the bed using grade 8's and Teflon locking nuts.

Sent from my G'zOne Commando

 

This ^is not enough!
Think of an accident or theft.
I would use a big metal plate below the bed to interconnect the bolts. This delivers a bigger area to spread the load to the bed. Huge washers below are also a must.

If it is aluminum you also should try to use insulate the tank from the bed because of corrosion. Use Teflon washers to avoid electrical different potentials.

But do have in mind that you must put the tank onto the same potential of the truck. This is a widely overseen safety thing to avoid sparks related to static discharges. Even if Diesel is relative safe- self ignition due to static discharge can happen...

 

I've had a transfer tank in all my trucks, never more then bolts with washers.

No issues.

However the next one I do will more then likely have the bolts welded to a piece of 2x material, then that bolted to the bed and the bolts sticking up...wait... scratch that. Weld nuts to the 2x and then that way when you want to remove the tank its not a matter of two people and under the truck and crap.

 

What would be the purpose of using grade 8 bolts to bolt somthing to sheet metal

 

The only reason to use grade 8 through sheetmetal would be you can torque them down tighter, and the tighter it is the more it acts as as clamp and is less likely to be able to tear through the the sheetmetal. Personally I would use at least a 2"x1/4" flatstock under the bed from bolt to bolt