That is the way me and everybody else in our club dose it. And someone always has minor damage Cracked fin, scratched paint ect. its the bouncing around in the bed of my truck that dose it's ( Yes its tied down and yes I use bubble wrap) The size of the (model rockets) are anywhere from BT 20 to BT 80.
Jim:
You said the magic word....Truck!
I have several interlocking 8 position racks that I can load in my Van and stake down on the field to hold a bunch of models vertically on the motor mounts.
the basic material for these racks is 1"x 3" x 8'-0" Pine or douglas fir lumber, and 1/2" hardwood dowels. add a few screw, a couple wingnuts, and a bunch of spent 18 and 24mm motor casings you have all that's needed to keep from damaging just about any model rockets you have.
Cut the 1x3's in half, making each rack 4' long. Layout the pivoting 18" "Feet" and the 4" spacer pieces between each. I notch the swing out feet so they only open in one direction. This makes them easer to control when you have a bunch your trying to carry empty. I alternat 1/2" diameter dowel lengths 4 and 6" above the support rail. this allow models to be stacked with fins out of the way rather then interlaced. 13mm motor models fit on the 1/2" dowels directly, 18mm motor casing slip on the 1/2" dowels, and 24MM casing fir over the 18mm casings allowing any combination of most common model motor configurations and clusters to be transported.
I've used as many as 8 of the 8 model racks on the field as one time, that's 64 models LOL!! each rack slide into the opening beside the one ahead of it with its angled feet interlocking with the openings under the preceeding rack, and has 5/16" holes in the feet to accept standard round aluminium tent type stakes to prevent blow over even in the highest wind conditions

Hope this helps. this racks are used for all models from BT-5 to BT-101 including many MPR upscale D12 clusters.