Heya everyone
Here's something interesting:
When you wipe at Flame Leviathan (or reset him) the vehicles reset in front of his area.
So my method when soloing ulduar is:
1. Take Chopper and using boost get to him
2. Get off and Kill 2 Big Colossus to trigger him
3. Get to the chopper and fast get to pillars ( he instantly pulls when sieges gate )
4. Be behind invisible wall, he comes and then resets (also nukes your chopper instantly)
5. After a few seconds you see all vehicles here and ready to rumble!
Thanks Khorium