The best replacement for stacks is queues.

The best alternatives to stacks are rated as following:
★★★★★  queues
★★★  blocks
★★  young money
★  straight pipe
★  sidney starr
★  hot wings
★  dual exhaust
★  queues java
  combos
  queues c++
  nelly
  heaps
  natalie nunn
  oshea

Your alternative for stacks is not listed? Suggest!
Speaking about stacks, one probably shouldn't forget about tonneau cover.

Other search terms related to stacks and their ratings are:
★★★★★ tonneau cover
★★★★ toolbox
★★★ soulja boy
★ headache rack
★ docky
You have in mind a companion for stacks and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of stacks in all years. Click on graph for more.
stacks
queues
blocks