Actually, you are the best one to make that call. If you are towing comfortably right now, your truck does not struggle, and you are able to brake and actually "stop" your rig, then your set-up is just fine.
Folks talk about weights, and yes they are important. I don't think your combination of truck and trailer is outlandish or anything. If you currently have the truck and trailer, experiencing no problems, then you are fine! Don't worry, just enjoy! Today's trucks are built pretty stout. If your truck had difficulties, I think you'd know it by now.
Enjoy the ride! (IF) the ride becomes uncomfortable or you begin to experience mechanical issues with your truck, then you might need to recompile all your data and think about a heavier truck. Until then ... nah!