The best replacement for trekker is trekkie.

The best alternatives to trekker are rated as following:
★★★★★  trekkie
★★  poweriser
★  micro crawler
★  afx fx-39
★  xlite
★  clam nanook
★  neoair
  lunar solo
  trekkie star trek
  neo aitr
  rock crawler
  wenger ranger
  icon variant

Your alternative for trekker is not listed? Suggest!
Speaking about trekker, one probably shouldn't forget about ian wright.

Other search terms related to trekker and their ratings are:
★★★★★ ian wright
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Google Trends

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trekker
trekkie
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