When we got our first twin axle we found that nomatter what we did we could not get the van level, after about 20 minuites of trying a chap came over and adviced me that i was using my leveling block on the wrong axle (the rear one), apparently the rear axle is a tandem axle and will not lift the van. i then put the leveller in front of the front axle pulled the van up and the van was level, one thing we do find though is that if we need to pull the van up the leveller more than half way the rear wheel comes off the floor which showes that the front axle does indeed take most of the weight of the van, seems very strange to me as i thought both axles would have been the same but it does work exactely as the chap said it would. our van is an ace celebration 590 2005 model so i assume all swift group vans will have the same axle layout and probably all vans with alko chassies. I don't know why it works or what a tandem axle meens but give it a go it may just save you some money.