[bionsystem]

It does happen, for example Paccar is a truck designer and sells licenses (apparently they also manufacture trucks but I think they used to only design them, although I'm not sure). I think some european makers do that as well and I would be surprised if Ford or GM doesn't. At least GM planned to buy (not sell) designs to Nikola if they ever managed to finish one (which I think they didn't in time for the deal to go through).

[zardo]

Paccar builds and sells trucks, not a license to build them. Other companies buy those add their own equipment (cranes, concrete mixers, etc) and resell them.

Light duty truck and van builders e.g. Ford and GM do the same thing but mostly for companies building RVs rather than commercial equipment.