Oxbow, welcome to dealing with the dot, if you call, your never going to get the same answer twice either. My insurance company has told me it's something like 115 or 118 gallons but to be safe stay under the 110 mark, you not only need an endorsement, but the vehicle has to be placard, carry the paperwork and then my insurance goes up about 800 bucks a year, but I can carry up to about 7, 100 gallon tanks of fuel and avoid the whole problem, I've been told they are working to change this ......................again, so who knows in the future.
Also a lot of quarries wouldn't let me in if my vehicle was placard for hazmat without added paperwork and grief so I just stay under the 110 gallons per tank and everyone's happy as of today, tomorrow I'm sure they'll decide something else. Every year I have to sit through the hazmat updates and have the expert dot people explain it to me..........which translates into, what did the dot change that I was legal to do last year that they deem I can no longer do this year.
On a side note, if you read the dot book and it makes sense, quit drinking, sober up and then read it again, I"m sure it'll be back to normal again confusing as ever with more interpretations than a you can count.
Also a lot of quarries wouldn't let me in if my vehicle was placard for hazmat without added paperwork and grief so I just stay under the 110 gallons per tank and everyone's happy as of today, tomorrow I'm sure they'll decide something else. Every year I have to sit through the hazmat updates and have the expert dot people explain it to me..........which translates into, what did the dot change that I was legal to do last year that they deem I can no longer do this year.
On a side note, if you read the dot book and it makes sense, quit drinking, sober up and then read it again, I"m sure it'll be back to normal again confusing as ever with more interpretations than a you can count.