I say get a 7x12 sa. I run a 7x16 dual with a 52z and a 48wb plus all the other stuff. I have found more and more that I want to go smaller. I looked a a enclosed 6x12 just would not work me. I realy want a 7 or 8x12/13 with a 5k axle. That way most days I could run just the z but when the wb was needed it would fit and I had some breathing room on weight. I say stay small for now then get bigger stuff as you need it.