If you mean erector launcher, nothing special - decoupler, axis to decoupled part, hinges to turret(or body) for axis, and landing struts. I use(for SAM) 2 pairs of LT-1 (one is important, second is not, maded for lesser angle) and LT-2(for maximal angle). Totally here is 6 positions up-down(3 for locked and 3 for unlocked suspension). Turret is 360* rotate, but artificially limited, mechanism is weak and fragile, need more work on this way. Totally there SAS module, some wheels for stabilization and beams like borders for mechanism. For MLRS can be used just 2legs(one for deploy and one for folding), but i use there 3 (one for reduce energy when folding). Aaand be careful when you do hinges for axis - Kraken can screw up craft, so do backups.