squeaky suspension any ideas?

Ryno, I assume it is the leaf springs that are squeaking?
Not familiar with Ironman, but my OME springs have grease points. You get a grease nipple and connect it to the grease gun. Press the back of the nipple up against the grease points (holes in the spring with what looks like a plastic lug in them. Just pump in grease till it starts to come out the sides of the leaves.

No more squeaks.

Mitsubishi has a fix out for it and will replace the spacers etc if you complain

1. Hotline Fix No. ML 34-001 "Squeaking noise from rear leaf spring"

Check this out
http://www.newtriton.net/forum/

a friend of mine had a squeak in his twin cab, spent near on a gran trying to fix it. they couldn't find it , was only with wife and young one in the back turned out to be a squeaky toy under the baby seat. had me laughing.