Sweet looking combination. If you decide that you need a "change of pace" on the shelves, you could always put a water tank trailer behind it. Hey, after you build the pool, you need to fill it up, right?
Do you mean the Revell of Germany Kenworth W900 or the Revell USA Snap Kenworth W900? Either way, the AMT trailers fit these kits. On the Revell USA kit, you just need to make the hole in the fifth wheel a tad larger. Here's a pic of my Revell USA Snap Kenworth W900 with the AMT Fruehauf tank trailer:
Gary Wallace from GW Trucks offers a W900S, a W900B, and (2) different T800 cabs. You can send him an email at gwtrucks@yahoo.com. His W900 cabs are about mid-1990s. There are currently no cabs offered (that I know of) for the other T-Series trucks.
If you don't need the trailer "right now", Moebius will be offering a 53ft Great Dane reefer trailer. I think it's scheduled for Spring 2012, give or take a little.