V2H is available w/ late year 2024 Equinox EVs and 2025 Equinox EVs
The GM "equipment" is so expensive (2X-4X what is reasonable) because it is not GM equipment. It is Schneider (Qmerit) equipment.
While Schneider is quality stuff, it is very difficult to find an installer who is a solar trained/qualified professional. And Schneider equipment REQUIRES a Schneider trained installer. The problem is with their software. It is not user friendly. Schneider concentrates on industrial usage/installs/sales.
Others (Enphase, etc.) are supposedly offering V2H installs next year. But while they may be less expensive than Schneider (Qmerit), they will not be reasonably priced. The technology is there but CoalOilGasUtility(COGU) fights, and to a great degree controls(ex.: solid state) most solar, wind and EV progress. They have billions of (tax free) dollars at their disposal. (only a grass roots movement has any power in fighting them and there is no such movement [apathy] at the moment).
It is therefor wait and see.
I am hoping the wait is not too long (getting older; am completely no combustion fuels for energy- heat pumps; provide more electricity than we use: battery backup, AC coupled, bimodal solar [provide all electrons for EVs via it]; own Equinox EV{V2H, plan ahead} and Bolt)