Hi Mark, sorry to read about your troubles but at least nobody was hurt! This could be the result of transmission wind-up. Does the Ward La France have an inter-axle differential between the rear axles? If not, how do the rear tyres compare in size? Ideally, all 8 tyres should measure within 1/4 inch diameter (according to google search) otherwise the axles will be fighting each other and something ultimately has to give! Are there any signs of scrubbing around the circumference of the rear tyres? If your tyres don't measure up the same then you need to swap them around so that the diameters match between axles 2 and 3. A difference in tyre diameter between the ends of any axle is unimportant. What about the tyre pressures? Any difference in pressure will affect the effective tyre circumference. Good luck with the repairs :tup:
Andy.