2018 Sealion Trailers SK-10-1200, 2018 SEALION TRAILERS SK-10-1200 For 2018 we continue to offer two lines of tandem axle boat trailers; a torsion axle line and a spring axle line. Single axle trailers all feature spring axles with an option for torsion axles for 96 and 101" wide trailers. Both tandem axle lines have the same quality construction but have different undercarriages and standard f...