On Roadking...mine is 3 years old.
I have the rwss series trailer, the RWSS19-21TB, 6Klb GVW model, tandem 14's. It has been adequate and is probably the least cost route. Leaf springs, tie-down disc brakes on the front axle. It has required quite a bit of maintenance and repairs in 3 years, but does the job. I believe they are under $4K.
If you can afford the torsion axle version with Kodiak brakes that would be a step up. The 4.5" I-beams are adequate for these smaller boats. Get at least 5K GVW, tandem or single for a 19' boat.
The design and components are good, they offer decent warranty coverage should you have a component failure.
My master cylinder started leaking in the second year. The referred me directly to Tie-Down Engineering. They argued a bit but then sent me a new unit no charge. I ordered out new pads and installed everything. Bleeding the brakes can be a bit of a chore - the top zerks were frozen so I had to swap the calipers side to side to get them to bleed properly. Within a year or so I'll probably have to install new calipers. Would be nice to upgrade to Kodiak components at that point. The springs are also pretty rusty and I keep thinking I'll get new ones soon. They are relatively cheap, like $30 each or so. The frame, bunks and winch stand are solid. Tires go quickly on these units, but they're pretty cheap too, like $70 ea for the Carlysle 14's, Sporttrac. I've replaced all four tires now. We did have to move the boat up about a foot and cut off the ends of the bunks. They've been re-carpeted as well.
The aluminum trailers are quite light weight, and have a nice spring to them so they pull very well. Saves about 400lbs over a galvanized. I put alloy wheels on mine and keep them and the rails polished - kind of a PITA. But looks really nice with the boat on it. I'm religious about hosing it off after every dunk in the ocean.