Need to rent a car for a few days in Ireland. Must take 3 car seats - one forward facing (stage 2??) with 5 point harness for DD who is 2 and 2 booster seats (the travel trunki ones) for DS's. Car hire is so expensive but the ford fiesta (hatchback one) is just in budget but will I cram them in? A bit desperate so please, any advice greatly recieved.