Not an A Body question

I have a 2002 Dakota Quad Cab (4.7l ). I was bummed out to find that it can only tow 4700 lbs. (towing wasn't on my priority list when I bought it) I have been shopping for travel trailers and finding one with a gvw of less than 5000 is difficult. The uvw of a lot of 'em are in the 4000 lb range, but I don't want to push it...

Anyone know how to increase the tow capacity? The only upgrade I've done on my truck is a magna flow exhaust - nothin else. Truck runs strong and has no issues- can't believe it tops out at 4700!!!
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