What does "upfit" mean?

To customize (a product, especially a vehicle) by adding extra features.

What is a synonym for "upfit"?

Common synonyms include: retools.

verb

verb ·Rare ·Advanced level

Verb

1
To customize (a product, especially a vehicle) by adding extra features. transitive
"The company can upfit police vehicles according to all laws and mandates."

"The company can upfit police vehicles according to all laws and mandates."