alright, here's a list of the cars i or my dog friends have used/currently use:
toyota highlander. i had a 2002 highlander up until a few years ago and it was great. newer highlanders have even more space. they're toyotas, so they're pretty reliable (my 2002 was 250,000+ miles when it was totaled). back seats can fold down, ive been able to fit 3/4 wire crates in mine (not ideal, i know). my friend who has a newer one can fit two medium/large RLKs and has plenty of space for luggage/gear. great offroading.
chevy equinox. if you're looking for something on the smaller/cheaper side, this is a good one. back seats folds down, can fit 2-3 crates in + gear space if you tetris it a little.
chevy traverse. the equinox's larger cousin, can easily fit 3/4 crates with lots of extra space. i haven't used one personally
honda pilot. my mom's current car. back seats fold down, can fit 3/4 crates if you tetris them. pretty reliable offroad, ive used it for car camping and it's more comfortable than it looks.
toyota sienna. my mom's previous car. if you want to go the minivan route, this is it. can easily fit 4 crates + extra space. again, toyota so it's relatively reliable, but not super great for offroading long distances. we've towed a 18ft pop-up camper with this bad boy.
ford escape. my current car. relatively reliable (ive had it for three months and have had a few slight, cheap issues (was also secondhand)). i can fit a medium wire crate and a medium RLK in the back with the seats up (haven't tried w/ seats down). about the same size as the equinox, pretty fuel efficient in comparison to others (drove
ford transit. i don't have a lot of experience with this one, just that its very popular for dog sport people. can fit at least six medium RLKs, ceiling is two RLKs high so you can stack them.
dodge durango. another friend's current car. she tows a 15-18ft a-liner camper with it. can fit 3/4 RLKs, space for gear.
subaru outback. this is another smaller/cheaper option. has towing capabilities, good offroading, back seats fold down, can fit two RLKs. not as much space as the others, and my friend who owns one has had quite a few issues with it, but ive heard that others have better luck.
chevy suburban. has lots of cargo space, can probably fit 4 RLKs. i don't have a lot of experience with this one either, but the two friends i have that drive some are very happy with them.
I'm not very knowledgeable about cars and there's so many options it's overwhelming. So having recs to look into vs just going in blind is immensely helpful.