Outer Limits 4x4 Board

I was reading the Queensland Transport Modifications booklet the other day and it stated 'thall shalt not weld the axle or any part of suspension components'
I want to install some simple spacers for my airsprings - nice sturdy blocks, on top of existing spring perches. Does this info in booklet mean I can only bolt them on instead of welding or what?

Thanks in advance,
Hardy

i think you answered your own question. Have a chat to good a 4wd mechanic.