These are more general tips.
Attack on Sanctum - 2 Wardens Up Top:
If someone happens to have called a ghost in, you can use this to bring any of the turrets up stairs pretty easily, although mics are needed to not do this accidentally. One player sits in the ghost near the side of the circles that boost you up top and the other player hops on the ghost front and then onto the platform. …Turrets can be brought up without the boost of a Ghost (or Warthog/Goose, I’m guessing) by having the turret drop onto the platform when climbing up, but it’s a bit tricky/lucky (or at least, I haven’t figured out the sweet spot if there is one)
As for vehicles you mentioned, I’ve gotten ghosts up onto the circles before, but they never go up top. I’m guessing since they hover, they don’t work. Did see people take up Warthogs, though. But generally they seem to get flipped or blow up.
March on Stormbreak - Kill 25 Knights (and other objectives)
You can take a Wraith on that large walkway that runs on the cliff side of the map. It helps on dealing with the 25 Knights that spawn on that center “dock” on one of the mid rounds and also on defending the fortress to a point, you have to watch out for Hunters, etc. so it’s more of a pro run. Head toward either base ending until around when you reach those little lower platforms with stairs where Hunters and other enemies spawn. On each side there’s a spot where the ground gets flat. You can put a Wraith up there, but it’s not big enough to maneuver it closer. What you want to do is balance a front corner of the Wraith on the lip of the walk where it starts to raise. Then somewhat carefully drive along the side, keeping your Wraith driving at an angle. When the cargo boxes are no longer blocking your path, you can push yourself up onto the platform. The opposite side from the starting side is better to fire down at that big “dock” area, imo. Writing this out, it seems more confusing than it is. Just ride the wall and a Wraith can be maneuvered.
March on Stormbreak - Round 2 Phaeton
When Round 2 starts, try to make a B-Line for the two stacked cargo boxes that are closest to the stairs that lead down to that little platform near the base (where the mid round Kill 6 Hunters and Round 1 boss soldiers spawn). The boxes are on the elevated part of that walk way, you want to run and stand on the lower part behind it that’s a little lower. Hug the wall where the boxes are, near the far side from the starting area (toward the center fortress). You can then pop out of cover and shoot the Phaeton pretty easily (You want an AR, really) and duck back to that spot for just about perfect cover. Very rarely will the Phaeton fly over head of that walkway enough to shoot you where you can’t get into cover, the main thing you need to watch out is not to walk too far to the opposite side of that narrow walkway toward the cliff as Soldiers and crawlers will occasionally pop up and start shooting. But I’d say roughly 90% of the time, you can use that spot to tear through the majority of the Phaeton, basically from underneath, and get the Survival bonus.
March on Stormbreak - Ghost boss enemies and Ghost/Gold Wraith boss enemies.
For ghost enemies, a Warthog is OP on this map if you’re a good driver. You can push them toward the cliff and shove them over the small guard rails and off the side of the map. You have to watch out for when they pair up and you have one or two shooting you, but that rarely happens. As well as the one you’re going after shooting you, but if you hit him right and keep pushing him around, he’ll either stop shooting or the shots will miss/go into the warthog and take forever. As mentioned, you can push them toward the cliff side of the map and send them out and over the side for a quick elimination, although be warned you generally aren’t given credit for the kill, but you can help with a speed round. You can also use a Warthog to flip the ghosts over, knocking them out of the vehicle and making it easier to run them over and let a teammate cap them with a BR/DMR. As for the Gold Wraith on the mid round, spawn a Ghost in the far base from the start area. Start to leave the base toward the cliff side and stop near the big entrance/exit. Parking all the way to the cliff side inside, start spamming shots at the Wraith. Eventually he’ll turn around and fire a shot at you. Strafe to the right side and keep firing. He’ll adjust and fire a shot there so move back to the left. Once you get the hang of it, you can take that Wraith out in under a minute. Just make sure to keep with the Wraith’s timing and not move around between shots much as if that happens, he can fire a shot into the middle and blow you up. If he does fire a shot you fear is going to the middle, I recommend gunning forward as his shots tend to go behind you.
March on Stormbreak - Final round 0/7 targets, kill the Elites and Hunters. The 3 Elites are dropped off by Phantom and can be quickly taken out in one fail swoop of a Banshee (fly down with speed boost and splatter them) or with a Ghost. The timing, especially for a Ghost, is tricky. One or two seconds too late and you can be blown up by their Pool of Radiances or stopped by a plasma charge and then blown up by the Pools. From my experience, using the Banshee is best done from the cliff side and swooping down into that little spot where they land. The Ghost, on the other hand, is better done from the far mountained side of the level. I park near the one side of that little back tunnel area, facing where they spawn and then drive in right as they start to fall from the Phantom. Once mastered, this will give you 4-4:30 minutes to fight the final four Hunters.
Urban - Final Round - 4 Soldiers and 3 Wardens. Similar to Stormbreak, you can take a Ghost (or Banshee) to the roof of the center area base and wipe out the Soldiers quickly. If using a Ghost, head to the center base where they spawn upstairs and head to the “back” entrance (the big base door that allows vehicles to enter quickly. It’s faces the opposide of the area where you start the first round.) and watch out for soldiers on the bottom floor (run them over). Head upstairs and start running into the boss soldiers. Sometimes it takes two hits as they like to hide around the pillars or you can’t get a full turbo push. You may want to kill two or so and drive off the side and head back in while recharging your shields. But it’s pretty easily done. The Banshees, I have yet to try, but seen it done successfully a few times. Fly in, fire a shot if wanted/needed and then splatter whoever has stuck their head out. Banshee seems a bit trickier due to spots for them to hide and probably takes a bit longer in general, but it has the added benefit of being a better vehicle to fight the Wardens in compared to a Ghost. Again, once mastered this should give you 4 minutes or so of time to fight the final 3 Wardens.