For huge things that need to get into orbit, I use a huge seven-mainsail-and-jumbo-fuel-tank design. It operates like a huge asparagus design rocket. But there are several common mistakes I make with this launcher that make me want to scream. 1. Seven mainsails? You're darn right I need struts. But, for some reason, many a time I have forgotten to put any sort of struts on. Hello, explosions. 2. At first I think it's smooth sailing and that I'll have plenty of Dv to get into orbit. Suddenly I realize there are fuel lines to redirect the fuel! Back to the VAB... 3. When ejecting one of the radial tanks, it doesn't fly far from the spacecraft. So here's a pro tip: never tilt a rocket while a radially-ejected payload is descending along the side of your craft. Before you know it...BAM! Asymmetrical thrust for you. I love this launcher to death, but dang, it's a beast!