Here's the problem, I want to stick a set of 16 x 8 MOAB wheels on my KJ (original TJ Rubi wheels in the US, very rare over here) but they do fit the KJ except the backspace is 1/2" less. This means a 25mm increase in track width. Since I will be also putting on larger tyres I think this would fail engineering. Does anyone know what track width increase is allowed?

Cheers
Glen