In reply to lanky:
Guess I'm the expert on this! Currently I transport my enduro's in the back of a Ford Galaxy, I can ram three, 450, 200 and 125 KTM's in. But I've been building and transporting the things for 40 years and death to them is not compressed enough, if they move just slightly they do it all the time in the same spot and take the seals out. Either you strap the bike down onto a block under the frame or pull it down like mad, half the fork travel is good.
If it's close on headroom like on mine we pull the front wheel out and replace it with a small plastic trolley wheel to make loading easier then crank the forks down hard. The springs don't care about the preload, I don't take the clutch and valve springs out either.
Alternatively just pull the fork legs out, I once transported my 490 Yamaha to Wales in the back of a Renault 4 like this.
There are also fork savers, effectively a lump of plastic which goes between the front tyre and under the triple crown, shit with road bikes though!
Post edited at 16:30