Still not sure what you are describing here. Is “album folder information” an Apple thing? This is probably why your truck can’t see it.
As @aerozol is also pointing out - just name the image file folder.jpg and leave it in the album folder next to the MP3 files. That is a very wide old standard for the image file to be called. Especially on older phones and MP3 players. And I expect in your truck is the same. Older MP3 players just looked for a simple JPG and displayed it.
If folder.jpg does not work, try cover.jpg, album.jpg or even (album name.jpg).
I used to do exactly this for my old Blackberry phone, various androids, tablets and older MP3 players. Before embedded artwork this was the standard way of doing things.
Once you work out what the file name needs to be, Picard can do that for you.