Hey Folks-
Just a comment here on the thread. I had my IS system installed along with Disc Brakes just before the Heartland Rally at MorRyde in June 2017. Great expierience!
I have yet to define the advantage over a standard axle - we still have stuff falling off shelves and drawers opening, etc. I can't tell adifference in the pulling but, it does look good.
THE DISC BRAKES HAVE PAID FOR THEMSELVES MORE THAN ONCE - THEY SHOULD BE MADANTORY ON A BIG 5TH WHEEL.
Thanks
For me, the peace of mind, knowing that I don't have leaf springs and axles is very comforting and worth some amount of money.
That said, IS can fail as well but it's very rare.
I'm with ya on the disc brakes - amazing. Call me a nut job, but I'm planning to add (disc brakes, not IS) them to my new 31' travel trailer!