How upgraded you looking to push them?
Militia K-9's to military equivalent K-9 Corps - 10 R, = 5 Handlers & 5 highly trained K-9's
Upgrading your elites Motorcycles... that can go so many ways depending on your vision. Basic mechanized cavalry / motorcycle Scouts / sidecar & hvy weapons. 10-15 R.
Something like an Exobike ? 75 R
Accreditation: Exobike was unused artwork from
Edge of Tomorrow
Edit: EMS Roadhogs would probably benefit most from sidecars (additional med supplies at hand for emergency triage)
Ghost Riders sidecar/exobike platform for combat jacket waldo style flamethrower
Roughriders would benefit most Exobike stacked armors make you extremely 'rough to kill'.