Tandem duals are the best but more expensive than triple singles. Featherlite makes a nice flatbed. Since flatbeds are relatively easy to build, allot of local shops build them. So do a search on the web and you should turn up allot near you.

 I had a 32' and 33'. I started with the trailer house donut wheels and switched hubs with the 6 bolt Chevy wheel. Then up to 8 bolt wheels on my last trailer. You might even luck out and get the same wheels as your truck. Also I started with shackle springs and repaired and repaired and then went to slipper springs and never worked on them again.

On flat beds hauling bigger loads, I like the slipper springs that have an equalizer. Torsion axles are independent and going over a rail road crossing ridge can put all the weight on the axle at the peak. I had a bed on the neck to for more hauling capacity, but wouldn't recommend it unless you are using a tall tall truck like a two ton and can cut the neck down. Much weight on the neck causes problems since they can move more than a 5th wheel hitch. Also if you haul often, get the oil bath hubs but if you only haul occasionally get grease hubs. A oil bath seal can dry out on top if not used.

Well David that was 20 years ago, but they were 6000 # axles and the 6 bolt hub which fit the Chevy wheel was common on that size of axle. I got the hubs from a trailer dealer who's in his eighties now. But the hubs fit fine, even the brakes. I could tell you stories about trailer house axles and all the donuts I went threw, both kinds. Even at 14 ply you had to keep 90 psi in those dad burned tires or they would disintegrate.

And I had triples to boot so you know the front and rear tires where trying to pop off anyway on corners. I was always overloaded so tripples helped at the DOT portable scales but they are a pain.