No those suggestions are even more ridiculous and impractical. There's no way you're getting $1000 per month; you obviously just made that number up. SUVs/CUVs (which most people prefer now) don't have separate lockable trunks. I don't want other random kids in my child seats either: think puke and head lice. There are at least three totally different types / sizes of child seats anyway (rear facing, front facing, booster with or without back) and the straps have to be adjusted to fit the child so even if the renter also has kids the type and number of seats are unlikely to match what they legally need.