Extra fuel tank under dry van

You don’t need a permit. You just need the axle and tires rated at 13,000.

 

Your broker is An idiot, hazmat is 119 gallons, that's why most transfer tanks in a pick up are 100-115 gallons, even on a little truck, you will need hazmat, and I believe tanker for anything over not a part of the trucks fuel system, usually anything less then 1000 pounds does not require placards on the trailer (depending on what it is) but it is still hazmat, if you want more fuel storage upgrade your factory tanks

Over 500 gallons of NON HAZ liquid is considered tanker.

 

Why? What do you gain from this?

Why add all the weight and things that will malfunction. just fuel would be 1200 lbs, then the tank and all the parts.

 

Not true. If you have a 13200 axel and H rated 16 ply tires on your steer your OK. My 780 (and I thought all 780) had that axel. Not sure why a dealer would order one without it? You may want to check. Look on the drivers door post. Sticker there will tell you the axel rating. Then check sidewalls on the steer tires.

 

YOU don't need any permit up to 80k. It just allows you to put more up there.

 

You can have your tank added to and make it 150. Change your steers to 16ply and your good to go. My 780 had 2 150 gal tanks and I still ran my trailer past the mid point by 2 holes. Kept the gap as small as possible and the steer when loaded around 13k.

 

Probably if your on a highway with a 12,000# axle limit. You can't drive there because of the weight on your tractor and trailer axle weights.

I had a truck with 150 gallon twin tanks.
Link to fmcsa 393.65 fuel system.

eCFR — Code of Federal Regulations

You can save money buying fuel in low cost states. Make sure you calculate pre ifta price.

Good luck