My Spoiler is a Series Omega shape in long-scale.
The case is quite large, relatively speaking. The ONLY car I have experience with is my wife's Buick LeSabre, which has a trunk large enough for disposal duties for certain, un-named Italian organizations . . . . It also just fits laying on the back seat with both doors closed.
So, you're gonna need a Suburban/Tahoe, or a large, tradtional American car, or at least a minivan or sport-ute. Forget Accords, Mazda 6's, BMW's. See Wolf's measurements above.
While I wouldn't leave it in the trunk, I certainly carry mine back there. I've had basses/cases I carried standing up, leaned back in the front passenger seat. Can't do that with the Series unless, again, it's a good-sized vehicle.
It's worth the trouble, but not compatible with a Miata !
J o e y