| The cost just isn't worth it
well, it really doesn't cost all that much more to get a tandem, especially as a percentage of the total purchase. it's not as important as maxing out the motor or picking a color that appeals to lots of people, but people do look at these kinds of details and the trailer might be a decision-point for someone between two similar used rigs (same thing with fiberglass vs aluminum trailer fenders). the cost is definitely worth if it means selling your boat sooner or for more money.
as for performance, i've owned both tandem and single axle trailers, and i cover a lot of interstate miles each year.
the ride at any highway speeds is definitely better with the tandem, it just plain rides smoother. the ease of movement with the single is obviously better, you can hand rotate it around in the garage or a driveway, etc.
my X-190 last year was on a single axle, and it was plenty adequate for that boat. it's great to have the option.
and this year's boat will be on a tandem, mostly because i'll be traveling more this year for tournament fishing and want the ride benefits, but also because i like the look of it better. i will also buy an axle lifter so that i can get one set of wheels off the floor when i need to move the boat around the garage by hand...best of both worlds!
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