Erm, on both those occasions I was actually driving up the hills when it decided to roll away. Might well be 9.5 tonnes. I have been away for 5 years and forget.
Dual drive could never give 100% extra…WTF are you rabbiting on about now? It gives nothing extra really. The steer axle is 7220 as I recall, the midlift is around 5 tonnes and the drive is 10.5 tonnes. The trailers need to have a neck rating of 13 tonnes to go to 44 tonnes so regardless of what drive configuration you have, you can only have an imposed weight of that 13 tonnes. Spread on 2 drive axles gives 6.5 tonnes per axle max, regardless of the capacity per axle. Personally, I would prefer to have all that 13 tonnes pushing an axle down on the road and have all of it pushing through one or two wheel than to have it fighting over a choice of four wheels.
Then again, as WN, NMM, me, and all the others know sod all compared to you, with your council driving experience, what more can we say? Clearly, we are all in the dark, probably stuck with our piddly trucks while you are more than able to blast past us at 90 mph in your 6x4 rigid pulling a 45’ trailer behind it, doing the work for free, because you know everything.
I have another one I would like to see you handle. A 6x4 pulling my old tanker out of Chard dairy with 20 tonnes of cream on board. It just would not work, especially if you hit that manhole halfway up over the hill.