Hi all,
I would not go back to a single axle mainly for saftey reasons, the single v twin argument can go on and on with different peoples opinions, but simple facts sell it to me,
2 brakes v 4 brakes
2 tyres v 4 tyres
In an emergency stop condition a twin has more contact with the road and 4 brakes, this can be argued with coefficient of friction and contact weight per square inch etc but on a road which is unlikely to be completely level and the possibilty of gravel or chippings etc the 4 tyres will give more grip. The 4 tyres also have more resistance to going sideways and are more plyable due to them being car tyres, a single axle normally has hard light commercial vehicle tyres which do not grip the same. A near 2 ton van on a single axle compared to a twin of the same size and weight will not stop as quickly or as straight, and if you take a possible blowout into consideration the comparison is a no brainer.
The only down side to a twin is moving it when not on the car, a longer van will react slower but I dont think the number of wheels makes a lot of difference, levelling is the same and with softer suspension and the weight spread over 2 axles the van will ride better and not bounce as much.
spj.