The best replacement for trunks is goten.

The best alternatives to trunks are rated as following:
★★★★★  goten
★★★★  cell
★★★★  frieza
★★★  boxer briefs
★★★  vegeta
★★  gohan
★★  androids
★★  board shorts
★★  briefs
★  boxers
★  footlockers
★  goten who is stronger
★  chests
★  tien
★  king cold
  shorts
  future trunks
  piccolo
  android 17 and 18
  speedos
  jammers
  freeza
  cooler
  cases
  brolly
  bojack
  android 18
  brief
  cell future
  benches
  trunks
  freezer
  lines
  footlocker
  lockers

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Speaking about trunks, one probably shouldn't forget about trunks.

Other search terms related to trunks and their ratings are:
★★★★★ trunks
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Google Trends

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trunks
goten
cell