Ok I'm not being a dick here BUT
Did you have to buy that monster in order to pass code? Sorry not getting on your case I want you to build something that works and will pass your local inspections.
Here is what I have learned from my first build:
When some people build a food service trailer or truck they want to do every thing the right way. And that's a good thing. I'm one of those types.
So in their mind if the code calls for a 3/8 thick wall pipe they use a 3/4 inch thick walled pipe thinking that is safer, stronger, and it must be better. But that's not always the case.
Now most of the builders don't read the codes fully or don't understand them if they do, especially on the first build I mean gosh it's not like your building several units a year, your just going to do one. And the health and safty people are very aware of this mind set, and so they often add their own increase in specs, knowing you didn't read or are not very familiar with the codes.
What I'm saying here is don't go overboard and cause your self a ton of problems down the road because your trying to be the good guy (I can see your white hat) and play by the rules. All the while adding more stringent restrictions than you need to comply.
I'm glad you got a deal on that thing. Take the top cover off and throw it away becuase all it will do is cause your drain water to splash all over the floor, when you drain your sinks.
Aren't you worried that when you move your unit the water in the P trap will slosh back and forth until it slurps (just made up a word) out and is all over the floor.
Also what are you going to use to attach the giant P trap from hell to your deck? Keep thinking movement, and water motion your going to move this unit and water adds weight and motion, adds force. So you turn right to go home and the water sloshes left then back to the right, you get the point.
Again not trying to be the bad guy here just trying to help from affair with a little experience in my back pocket.
One other thought your pump line needs to be attached to the floor in at least a medium manor other wise it will also break from the motion, caused by the psychical movement during travel. Your going to need to be able to get to your tanks, water lines, and fittings, so leave yourself as much room as possible because sooner or later your going to have to do some sort of repair work.
Your pvc lines will eventualy get brittle (they all do) and then they crack very easily. So always keep that in mind.
Otherwise looks great LOL
Edit to add:
PS paint the frame work (2 X 4s ) now before you get to a point that you can't paint them. Otherwise they will look like hell as they absorb dirt, oil, what ever, and I'll bet your code calls for no bare wood.
<message edited by Dr of BBQ on Tue, 03/9/10 11:20 PM>