The best replacement for f550 is f450.

The best alternatives to f550 are rated as following:
★★★★★  f450
★★★  f650
★★★  dodge 5500
★★★  f350
★★  phantom 2
★★  5500
★★  ram 5500
★★  phantom
★★  s800
★★  c5500
★  f600
★  f450 dji
★  f660
★  terrastar
★  f770
★  np f330
★  hw-f450
★  f750
  tbs discovery
  chevy 5500
  f450 sound bar

Your alternative for f550 is not listed? Suggest!
Speaking about f550, one probably shouldn't forget about air brakes.

Other search terms related to f550 and their ratings are:
★★★★★ air brakes
You have in mind a companion for f550 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of f550 in all years. Click on graph for more.
f550
f450
f650