I think the big differance is price I replaced all 4 shocks on the Silver Abaltross for less than $100. had them matched at My local parts store I have no Ida what horrizonal shocks are these are mounted in a vertical position.And they do the jopb and have been for 20k miles. I repeat that in many cases the only differance between what is made for RV and Marine is the decal and the price.
Jim Smith