The Numbers...
Ken - If I were you, I'd go back and read RustyJC's post. If you don't fully understand it, I'd read it again, and make sure you fully understand it. Ask for clarification if you don't. Before you buy the trailer, see if you can tow it to a CAT scale.
I think your and my trucks are similar, except mine's a 6 speed (see my signature). I'm pulling a 33' 5th wheel (one super slide-out), that runs about 9,000 - 9,100 lbs. With just my wife, my 1yr. old son, and me in the truck and a full load of fuel (nothing else in the truck). I'm running about 500 lbs over the GVWR (8,800 lb. ). I don't wanna be over GVWR. I think you may wind up farther over GVWR than me.
I think your truck will pull that weight all day long, very effectively (maybe call DTT), and stop that weight pretty decently (with an effective trailer brake). But I personally don't like being over GVWR for the legality of the situation. Don't get me wrong, it ain't gonna stop me from going camping, but it's sure got me looking to buy an '03 3500, depending on the size of the back seat of the 4 door cab. Or I may buy a 4 door PSD. I'm not sure, I sure would rather have a Cummins though. Geez, the thought of owning a PSD versus a Cummins, I don't feel so good, I gotta quit thinking about it.
I'll be sitting back here for about 1 more year, taking good care of my truck, waiting on the new 4 door, hoping it'll be bigger than the 1500's 4 door cab. Also, I won't be buying the 4 door if D/C shortens the 8' bed to do it. I love my 8' bed! I'll check out the '03's real good, and if I like 'em, I'll order an '04.
- JyRO