Man,,,, that truck will pull a 5,000'lb total weight trailer with no problem! Tandem axles and electric brakes can give you a lot of room to cheat those numbers even higher! I'll bet your gear doesn't weigh 3,000 lbs !!!!!!
Just load up as to not to put too much tongue weight on your truck ,,,,about 200 to 400 lbs tongue weight. Too much will put big load load on rear axle,,,,,, That trailer will be fine loaded behind that truck! My good friend has that same truck to pull his lawn equipment in an 18 foot tandem with no brakes! His trailer is 2400 and his gear is about 4,000. He is at least 6,ooo. He has been pulling for 8'years now every day. With 4 of his fat ass workers in it,,,,, Manufacture warning is always way too conservative in their favor!
You got the right rig to do all that you need! Now go out there and play some music,,,, that truck and trailer is all that you need to get the job done safely! I have seen a lot of people do a lot more with way less that that great rig that you put toghether!
Good luck bro!
Your rig looks like a professional dj with nice equipment! I would hire you if I saw that rig!