Is this what you mean?
Cut posts to fit, attach boads.
More detail.
Last detail picture.

The front with the two sides tied in together makes for a strong fitment. These boards on my truck are more decorative than strong, a good 1" board would be advisable for heavier hauling. I have seen the heights go as tall as the cab,I suppose for transporting goats, pigs, or some other small farm animal.




~ Cosmo
1949 Chevy Half Ton
Rocinante, like Don Quixote, he is awkward, past his prime, and engaged in a task beyond his capacities.
"...my good horse Rocinante, mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes
"If you come to a fork in the road, take it."...Yogi Berra
"Rudeness is the weak man's imitation of strength." ...Eric Hoffer