Ignore "dry weight" Look at the GVWR and assume the hitch weight is 12-15% of the GVWR.(GVWR is the max weight allowed).
There are multiple ratings you need to stay within (at least if you don't want to be over the manufacturer limits)
- Tow rating (the 5000lb number you gave us)
- Max Hitch weight (how much weight is on the hitch)
- GVWR (truck): which includes any people, gear and after market stuff on the truck along with the hitch weight...have running board...that uses up 75lbs...roof rack..etc..
- CGVWR (total for truck & trailer)
- RAWR (rear axle weight rating) Most of the hitch weight will wind up on the rear axle.
As mentioned, you don't have much of a tow vehicle. Realistically, you are probably looking at trailers below 3000lb dry but again look at the trailers GVWR.
