Truckin magazine was published monthly by TRM Publications in Anaheim, California. The publishers, Tom and Rose McMullen, saw a growing trend in custom vans and pickups cruising around Southern California. Named after the popular saying and the R. Crumb comic, "Keep on Truckin'", the first issue went on sale in Summer 1975. Content included feature articles, truck profiles and how-to articles.

From 1975 to May 1995, Truckin was owned by either McMullen Publications or McMullen-Yee Publishing. Mr. Yee died in 1994, and Mr. McMullen died in a tragic accident in 1995. The editors and staff rode a wave of changes as the title moved through various new owners:

The table of contents, if available, can be seen by clicking on the icon.

The publisher provided net paid circulation data to various periodical compendia from 1978 to 2005 (which is the last year for which we have data at this time). Over this time period, annual circulation averaged 250,000 print issues, and the reported values ranged from 142,000 to 523,000.

An estimated 534 issues was printed from Summer, 1975 through November, 2019. Only images through 2000 are included at this time, and all are complete.