Ok so i may have a new job and have to go to training in a suit. Problem is the office is half an hour from my place and all freeway and my truck is dead. Whats the best and simplest  way to stay safe and not look completely unprofessional (i.e changing in a bathroom or around the corner) ? or is that my only option.   

My vote is to change in the bathroom.  Of course, you'll have to arrive a little early.  Don't forget your comb.

Depending on the size of your gear you could just wear the suit underneath and then strip in the parking lot.  Some manufacturers make overpants with armor and whatnot   

+1 on the bathroom or you could just pull a Clark Kent and use a phone booth   

Lol even it'd f%$k up the suit i think it'd be pretty sweet to ride around in it james bond style

James Bond cool? Yes! but on a gs? plus not safe.changing in a bathroom makes the most sense since i dont have gear big enough to wear over and theres a fast food place across the street. But that means carrying my suit in a back pack and getting wrinkled. Any thoughts?

Wear it like a cape in a protective plastic sleeve? Idk...

What's unpro about changing in the bathroom?  Fold the trousers and jacket and put them in a backpack, wear the shirt and tie.  If you fold your trousers and jacket carefully and tightly, they won't get wrinkly (although hard cases are even better).  Change in the bathroom, stash your gear under the desk.

Roll -- don't fold -- your clothes. Then change in the bathroom.  I have some cheap, soft saddle bags.  They are easy to put on and off the bike. I wrap my clothes in a plastic bag 'cause the saddle bags are, ahem, water "resistant" only.

My coworkers don't mind my occasional wrinkles. They're jealous of my ride.

I've had the same problem in the past, simply wore my bike jacket over the suit and rain overtrousers which I took off, rolled up and stuffed in the topbox when I got there.
Walking into the room in suit and tie carrying your crash-hat can have a certain affect.

Aerostitch does this very well - put on suit, put on 'stitch, ride, take off 'stich, dressed and ready to go.

Of course, it costs more than some GS500's, but...

Ok heres a theory. Card board. Fold pants between two pieces and strap to bike or put in a back pack. Get near work and change. ??

just ride in the suit, when your co-workers comment on your very wrinkled suit,  tell them it's the newest fad.      

Rolling is the way to go, with a little practice you can get it rolled tight enough that it'll look like it was freshly pressed.