it makes it not function as a truck for myself.
use whatever definition you want for it though.
use whatever definition you want for it though.
No, you use a truck to accomplish tasks for which vehicles don't get named "truck". That's perfectly fine; you can and should do whatever you want with the vehicles that you buy. When you go out in public and say "that's not a truck" about something that clearly is, it's you who is "using whatever definition you want", not everyone else.
If it's the latter, you'll have to do so amongst yourself.