Using a 1/2 ton PU to pull a 3 horse gooseneck?

Yes you can upgrade the brakes. Search the after market performance catalogs. Jegs, summit racing, 4x4 off road magazine. Etc...
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I suppose it's important to mention, keep the trailer brakes in good working condition. A trailer without or poor brakes will shove a light truck all over. At let's just est. 7000lbs the trailer out weighs an average 1/2 ton by 2500lbs. Even in my heavy duty dually, my trailer does most of the braking.
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Keep in mind that from a legal, and insurance perspective, you cannot change the rating of the truck, no matter what parts you add.

I don't think I would worry about the truck brakes as much since you should have it set up where the trailer brakes engage a slight more than the truck thus trailer brakes way more important in my books

Gunslinger is right you can't change the rating of the truck, but you might need to register the truck for a different gvw (as long as it is still within the legal limits of your truck which a 3 horse aluminum would be easily) the additional parts are for safety & longgevity of the truck

I pull a 3 horse slant with living quarters with a dodge ram 1500 4x4 the only thing we did was out air bag over loads on it and it does a great job.

Well, I think you still need to worry about the brakes. Electric trailer brakes sometimes go out (bad connection, broken wire) and you want to be able to control your load under any circumstances.

Your truck will handle your load under the circumstances you posted in your opening post. No doubt about it.

However, something you should check out BEFORE you lay down the money, particularly to a friend, is whether your truck will fit under the gooseneck! With the trailer hooked up and empty, you need to have an absolute minimum of 6" clearance between the frame of the gooseneck and the bed of your truck. I don't mean almost or just about 6", I mean at least 6". Even at that you may get gooseneck rash on your truck going through dips or bumps, or entering or leaving a driveway.

You should also look to see whether the trailer will sit fairly level hitched to your truck. Some goosenecks just aren't made to fit Dodge 4wd trucks. With a bumper pull, you can buy an extended-drop hitch, but for a gooseneck you are limited by the truck bed height.

I'm in the process right now of trying to lift a trailer I bought to give me more clearance over my pickup and to level the trailer. I have the 6", but the trailer sits at an angle and it's uncomfortable for the horses for a long haul.

Hmmm. You said Featherlite and something about great price? On second thought, tell me where he lives and I'll go hook it up to my truck...I'll let you know later if it would fit yours!