I like to see new things... but I don't see the point at all with that trailer.
1) To be legal as singles... it would have to be registered as two trailers. SO... you would pay 2x the tax, and 2x the registration $$.
2) As above... there are more tires, bearings, lights, and parts to maintain. (= $$)
3) With more tires, bearings, and frame parts... that trailer will be heavy. Add that to the rolling resistance, and it will cost more in fuel to pull it.
4) Reflecting on #1... it may be of questionable road legalness, since it may be considered a "Double" (like a big-rig pulling 2 trailers)
5) Reflecting on #1 again..... If it's registered as one trailer... then only one of the singles would be a legal trailer, since the manufacture CAN NOT put the same VIN on both parts.
6) Since it all comes apart.... you can't mount a trailer box anywhere. I know that's not a big deal to some... but it's nice to have on a double trailer.
Anyway... I don't see what the big deal is, pulling a double trailer (if you own one) and only launching one ski. I do it all the time. If there is ANY benefit to this new trailer... let me know.