what did you have to do to go to 4k? mines got air suspension (rear) and I have just put new tyres on and went for 225's so would be interested to know if I have to do anything else
I have had air assist on the rear axle ( this works alongside the original suspension) and replaced the front springs. I was told my tyres had to be rated at 112 or above. The tyres I have are 225/75R 16CP 116Q
I could have gone for full air suspension at 7k approx if I had robbed lloyd's first