Since you are vaguely thinking of chassis alterations, which I get the idea is something you like doing, then if you really, really don’t want to fit super singles on the front you could try shifting some chassis weight, fuel tank if heavy enough and possibly the hydraulic oil tank, to behind axle 3. If its design weight allows you could then investigate the possibilty of uprating axle 3 to 8 tonnes however that may involve the super singles you don’t want. But to do this you need to know how much weight you are transferring and the location of the current and proposed sites. The actual individual weights for the unladen bogie would also be a good idea. That is obviously a lot of work compared to the 30 minutes for swapping the front wheels.
A potential problem was discussed on TNet about a year ago. A 6x2 rigid was overbraking on axle 3. This was eventually traced to a fault with the axle 2 airbag pressure sensor. A fault with this will throw all theoretical calculations out of the window since the bogie weight will not be split as the manufacturer intended. You need to know whether this split is a straight line percentage progression from unladen to plated, or whether axle 3 only alters at set points for axle 2. ie does axle 3 stay at say 3 tonnes, and not alter, while axle 2 varies from say 7t to 9t, and only when 9t is reached does axle 3 carry more weight?
if I could get to 8300,8500,or 8700 on 315s that would do .
