The best replacement for wagons is hatchbacks.

The best alternatives to wagons are rated as following:
★★★★★  hatchbacks
★★★★  minivans
★★★  carts
★★  carriages
★★  pull carts
★★  sedans
★  crossovers
  suv's

Your alternative for wagons is not listed? Suggest!
Speaking about wagons, one probably shouldn't forget about rubber wheels.

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



Google Trends

Scale is based on the average worldwide traffic of wagons in all years. Click on graph for more.
wagons
hatchbacks
minivans