Lotsa rope
As a preventer, we take the vang to the toerail. However, this is not the best solution. A good preventer goes from the end of the boom to the bow and can get quite complicated. You won't rig it unless you are going to spend a lot of time going downwind in flukey winds abaft. Our short cut preventer risks breaking the boom because it is attached to the boom only about 25% of its length. A whisker pole is great. Get a line drive that can be infinitely adjusted at the mast end. Don't know about a 30 but on our 37, you need a topping lift and a foreguy. That sucker is heavy! You can't depend on the jib sheet alone to keep it in position. If your lazy sheet is long enough, it can serve as a foreguy when cleated to the bow cleat.
