1849 (n.) "a stage of a journey by ox wagon;" 1850 (v.), "to travel or migrate by ox wagon," from Afrikaans trek, from Dutch trekken "to march, journey," originally "to draw, pull," from Middle Dutch trecken (cognate with Middle Low German trecken, Old High German trechan "to draw"). Especially in reference to the Groot Trek (1835 and after) of more than 10,000 Boers, who, discontented with the English colonial authorities, left Cape Colony and went north and north-east. In general use as a noun by 1941. Related: Trekked; trekking.
<a href="https://www.etymonline.com/word/trekker">Etymology of trekker by etymonline</a>
Harper, D. (n.d.). Etymology of trekker. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/trekker