No idea but I bet that 4.7 rocks.
When I work at the speedway for NASCAR we are doing around 70 when we respond with crash trucks.
I've been known to do over 100 mph down the front straight at Mid America Motorplex in Glenwood, IA with my Jeep. You just have to know to slow down before the turns. Yes, I am very aware of how the additional weight will affect the handling. As for the insurance aspect, just like if I rolled it off a mountain side in Colorado rock crawling, if it is rolled or destroyed on track, my personal insurance will not cover it, but our club insurance will.I would hesitate to use my personal vehicle for any work related hauling, like someone else said, insurance will find a reason not to pay. You are using an already lifted vehicle to respond quickly to an incident on a race track, you will likely drive faster than you should, which could easily spell disaster for you and your Jeep. Something to also consider with carrying liquid is that it moves, when you go to stop the car, the water will still want to keep moving making it more difficult, plus it changes the way your car handles dramatically. If the track already has a fire response vehicle than I would think they need to be equipped to handle any fire that might happen in their venue. Your club needs to review its needs with the track to ensure they can handle incidents accordingly. Like many people have said, we all have overloaded our Jeeps or other cars at one time or another, it does not make it smart or right. Good luck to you in finding a solution!
Thank you!!!I live in Grass Lake, Michigan. Our Fire/Rescue bought and outfitted a 2009 JK Rubi for just such an operation. Here it is in action:I have seen it go LOTS of places with that setup. I doesn't even slow down over rough terrain with it. The last time i saw it was cruising across a farmers field at 40 mph to a brush fire. The jeep they used before that was a CJ6 with the V6.