There is no alignment for these and the dealer should have told you that, other than checking the axle position on each side. You would measure the distance from the axle to the center of the hitch. If that's correct, the geometry of the axle is not right and needs to be replaced. Most likely the axle was bent incorrectly when being bent causing the tires to lean to the side. I'm not an alignment guy so I don't know what the terminology is.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115
Bitter Gun Owner