I'll come back to you on the transport issue once I've transported them to our British Lead Adventurers Meeting this weekend!
I have sprayed the Woodland Scenic trees with an awful lot of scenic cement, so they're pretty solid, but obviously any type of miniature tree covered in flock type stuff is prone to deterioration over time. I wouldn't be happy about the Woodland Scenic trees individually based or in small CD-based clumps, in a box, all knocking against each other in transit. But the joy of the 'spiked' approach, is that you plant all your trees in your terrain boards (or in a spare slab of styrene for transport) and they are inherently stable. They cannot move around or rub up against each other causing foliage to fall off...
Obviously, the downside is that you need a big enough car to move the boards intact. Public transport would be right out

That's the theory anyway. I'll let you know next week if it worked.