Hi xtreme.
There were also problems with the Transfer box oil boiling up due to the small amount of oil contained in the box,
and the fact that there is no oil cooler fitted. We had problems with the input and output seals leaking due to over heating of the box.
As Richard said, the Michelin tyres are an issue on sustained maximum speed motorway work. After all,they were designed as an off road tyre. I think if my memory is correct, that Michelin state max speed and time restriction on there
XL, MXL, ZXL tyres for warranty. I know this is the case on the Airport crash tenders due to there high speed (85mph) and the need to meet NFPA regulations.
Hope this is of help.
Clive