Okay, here's a trick:
On Liberation of Camp 4 work your way up til you can trade in the STAP for the Flash or Gian Speeder. Then, head back DOWN to the entrance gate. Using your speeder, try to jump over the sides of the gate using the small hills as your ramp.
I did it with the Flash Speeder on the right side jump, but only after MANY attempts.
Just thought it was pretty cool! I started trying after I lost a ship and blew the Gold (this level is my last silver -- rrrrrrr).