Bone and KGB are correct on this one.
There is no advantage in creating an LLC for a f&f account in a different state. In fact, quite the contrary; you might end up getting yourself into trouble.
The LLC is a pass-thru entity and you'll still pay tax on income where you reside. The problem is that most states require state registration if you do business in that state. IOW, you can go right ahead and start an LLC in a different state, but if your F&F live in your home state, you won't be able to manage their money unless you also register the business in your home state.
In a nutshell, the 'LLC in a different state' argument is misrepresented and actually dangerous for most people. The only tax advantages you might receive in an LLC would be the direct result of electing to have the LLC taxed as a corporation. Then you would get the lower corporate tax on retained earnings. But if you are profitable in your trading business, that benefit runs out in a hurry (once you've accumulated $250K) and then you end up with the worst tax vehicle you can imagine for trading as you begin to pay an outrageous accumulated earnings tax.