When I was hauling around the boat anchor that was my SVT4 PRO (damn they're heavy, relatively speaking), I used an SKB rack box. They are quite heavy duty, don't add too much to the weight and are relatively inexpensive for what you get. They come in all kinds of different rack space sizes and if I remember correctly, the SVT4 PRO is a full 3 rack spaces all on its own.
Killer amp btw OP but I have a feeling you already know that.
