hyster

if I only use 1 coupler per stack it wobbles all over the place and more than likely breaks free and blows the rocket up. i want to create something like the space shuttle (with liquid rockets instead of solid ones) with the boaster on the side but use 2-3 stacked together. if i use struts to secure say the top would they release with the decoupler ?

im trying to stack tanks along side another tank nd when the fuel runs out use the decouplers to jettison the empty tanks. I can do this with 1 tank but if I use 2 tanks with 2 decouplers the 2nd decoupler does not attach so I have 2 tanks being held on with 1. I searched the forum and wiki and carnt find the info. also is it possible to stack the solid rocket busters so they act as 1? when I stack them they act as individual busters thx for any help