What would be good supports to use on Giga coasters?

It really depends on what kind of giga coaster you are making.

Well its like Millenium Force with a bunch of hills and stuff.

If you wanted to do supports EXACTLY like Millennium Force, you might as well give up, especially if it's more than 150 ft tall in game. However, we could forgive you if you just used the Hyper supports in Jcat's Steelworx. But for the overbanked turns, you might be able to create a close recreation with Moby's Steel Jungle. Check out some pictures. This shows what the supports are like for the hills on MF, along with the type of design used to support the overbanked turns. Leave a like on my band's Facebook page if this helps!

use safarij's arrow supports for the lift hill and airtime hills.