Well I hate to bring you down from your cloud, but you that you should have just ordered from northern tool. I went the same route you did with RDS getting the black powdercoated 51 gal tool/tank combo. Well their 'powdercoating' is a total joke. It's nothing more than some really easy to chip black paint. ANYTHING that bumps into the tank is gonna chip the black powdercoat, and you'll see the silver diamond plate showing through. I didn't have mine long before it was looking like crap, and I didn't like always having to be careful around it.
My first RDS tank was defective, the welds broke on the tabs that hold the tank down, which they replaced under warranty, and changed the design. There used to be two tabs up front. Now there is one up front and one on each side for more stability.
Wolfman if you can I'd cancel your order or have them charge you less and sell you the silver one. Since I originally bought a black powdercoated box, they replaced it with the same. Well before installing I took it right down to my local line-x shop, and had it stripped and line-x'ed. I'm happy to report it's fantastic, and matches the bed perfectly. NO more worrying about bumping/chipping , or having to wash it with the truck so it looks nice. I highly recommend this - they charged me $100 out the door.
A word of caution - RDS does NOT clean their tanks - they simply hook them up to a high pressure vacuum. I've talked with them a few times about it and they don't seem concerned. Well let me tell you, I have a 2 micron racor filter plumbed between the RDS and my main tank, and both times I installed the tanks I plugged the filter to the point it wouldn't even flow. The second tank clogged 2 filters... both full of dark metal shavings etc. . Disgusting.
Let me know if you need any tips on installation or plumbing it. Overall I'm really glad I went this route. Including line-x, racor, tank, and all installation fittings, I was under $600.
Hope this info helps!