The decision on roller vs Float-on style trailer depends on what sort of ramps you'll be using. With a good roller trailer and a power winch, you can launch and retrieve the boat almost anywhere and not have to dunk the trailer, but you need a good ramp with a float on trailer, and that can be a problem if you have to contend with a large tidal range. A single axle trailer will work fine for a 20 provided you have enough weight on the tongue. However They aren't quite as stable as a tandem when towing, so tongue weight is more critical. You can adjust that on most trailers by moving the axle.
Although it took me awhile to get the rollers adjusted correctly, I personally prefer the EZ loader style which uses the yellow rollers with nylon bushings on aluminum shafts that don't require lubrication. The trailer pictured below has served me well for 25 years with salt water use, and since I don't have to dunk it, it still has the original springs and axle and requires virtually no maintenance! A chord running from the winch switch to the back of the trailer also makes it very easy to load the boat if you're by your self! Not as quick as a float-on, but you save lots of time on maintenance! If you get one with a 5000 lb axle and 6 lug/16" wheels, the big tires spin so slow that the tires and bearings are also very durable.
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