Well, as some may know I'm a bit of a GCW fan now, so I had to come show my support for it here (I hope this is a good place for it). I have 3 traders right now, and I've been running as many battles as I can on them.
There are noble ways to earn tokens and rank as a trader if the battles are good. You can also have multiple wins within a 30 minute battle phase at 1000 GCW points per win, not including the building, repairing, and fighting you do. Really, a trader can always earn GCW and tokens building assault points and repairing "damaged vehicles" even if nobody else is around, but it's not a place I'd go SF unless you know you're guarded, otherwise safe, or don't mind getting killed a lot.
Don't be too reluctant to go SF as a trader in a well defended city. Even as SF you are immortal within range of a barricade (you'll have the Barricade Protection buff icon), and if you build quality kits for others and save your fatigue during the build phase you'll be able to repair that much more quickly. You can also repair while in combat, meaning you can keep your own defenses strong and guard that General while you help take out grunts, elites, bosses, and even other players for great GCW points and tokens. Plus, how often does a trader get to rake in the PvP kills and Rank Badge collections?
I got 12 PvP kills on 1 trader in 2 weeks of battles defending Generals, the highest number on any of my 8 toons since I never cared for PvP. You don't have to be grouped or outdamage your fellow SF's, just contribute to the kill as best you can. I highly recommend a rifle and a launcher pistol (special heavy weapon with 64m range, 1300+ DPS, up to 216 Heat damage, and no profession restrictions), but I noticed the launcher pistol does eat my traders' action pool leaving me "Too Tired" to fire so have that rifle handy as well. Another of my traders only has 3 PvP kills but over 1000 tokens. Honestly, if you're supporting a good group under good conditions then 3000+ GCW points and 100+ Tokens in a single 30-60 minutes is not unreasonable even for a trader. I think these GCW invasions raise us from modest "Jawa" traders to a cool "General Lando Calrissian" status. Anyway, just wanted to spread a little support for the GU, and I hope I've piqued some interests.