You can do what you want but Im telling you right now 3000lbs is 2000lbs too much for you truck. It is not a matter of if the engine can pull the load, it is a matter of whether the brakes can stop the load and whether the truck has enough weight and wheelbase to keep it under control.
If you have to swerve to avoid something or slam on the brakes you are going to lose control, and if whoever you run into decides to sue, then your ass is going to be in a sling.
Besides all the legal and safety stuff, the truck is going to ride like absolute ass. Every time the trailer hits a bump the truck will buck and pitch like a rocking horse. And if you decide to get on the expressway to try and actually get somewhere you will be white knuckling the whole way trying to keep it in your lane. And I know boat trailers dont sway too often, but if yours decides to, a 3k lb trailer behind a 3k lb truck will both be in the ditch before you know it....
Talk you out of it yet?
I wouldnt do it. Not on purpose anyhow.