The best replacement for trough is ridge.

The best alternatives to trough are rated as following:
★★★★★  ridge
★★★★  peak
★★★  through
★  trench
★  crest

Your alternative for trough is not listed? Suggest!
Speaking about trough, one probably shouldn't forget about hay feeder.

Other search terms related to trough and their ratings are:
★★★★★ hay feeder
You have in mind a companion for trough and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of trough in all years. Click on graph for more.
trough
ridge
peak