Re: 3\"trailmaster & 2 \" OME shocks
I have a OME system, + 2" springs and shocks.
I found that the shocks weren't long enough for the springs at full droop. So I upgraded at the first opportunity.
So for a 3" spring kit, I doubt it.
Better to measure your droop (on the vehicle that is) and get shocks to match, or allow for any future mods you may intend to do.(i.e. even longer shocks)
even if you think you can't afford it, allow for it 'cos things can change fasyter than you think.