Again, the dry weight is a totally meaningless number except to the guy who transports the rig from the manufacturer to the dealer. Your rig was already well beyond its dry weight the day you picked it up from the dealer. Use the max weight for your calculations.
Now that you've found the right sticker, let me suggest to you
this online worksheet. You'll have to get the numbers from various sources (for one, you'll have to crawl underneath your rear bumper and read a label on the underside of the hitch). Once you've worked through it, and once you've familiarized yourself with "typical" payload numbers for 1500, 2500, 3500, etc. class vehicles, you'll develop a feel for what numbers are important, which ones aren't, and whether a given rig is likely to be able to pull a given trailer within limits.
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