You get what you pay for when buying trailers. Been there, done that. Since you are hauling commercially, do you really want to take a chance buying a cheap trailer? Some manufacturers still use scotch locks for their lights. With the wires and scotch locks exposed to the weather and road grime, how many miles do you suppose it takes before that causes a problem? 1 season is all it took for my snowmobile trailer.
I have owned two PJ goosenecks, 1 was a 30' triple axle with Quality axles, didn't have any problems with it at all. My current trailer is a 34' triple axle that started out with Quality axles. The brakes didn't work worth beans, the dealer tried numerous things to get them to work, no luck. Finally PJ replaced all 3 axles with Dexters under warranty, the brakes work great now. I have the standard leaf spring suspension, I looked into air ride, but it's definitely pricey, especially for a triple axle. However, if I was running commercially using my trailer every week, I would have purchased air ride and never looked back. I would have air ride on my truck as well. I do have a Cody Cushion Air Ride hitch that makes a pretty significant difference. If you're thinking of going air ride, I highly recommend the hitch.
I just got back from a trip that was from MT to MD and back, had 9,000lbs on the trailer on the way out and 14,000lbs on the way back. After slamming and banging over the **** poor roads out east, I can ABSOLUTELY see the value in full air ride.
When I got home I had a back ache like you wouldn't believe.
I used to drive those roads all the time in a semi what was the typical full air ride (truck & trailer air ride, truck cab air ride, air ride seat, leaf spring front axle) it never beat me up even remotely close to what the pickup and gooseneck did.
Cheers!