For a recent day trip involving 5 adults, 3 dogs, and our gear, I picked up one of these to carry our coolers. It worked great.
Harbor Freight sells 2 or 3 different ones, and this is the least expensive. I was able to pick it up for about $50 with a coupon. In short, it is well worth the money.
The basket needs to be assembled but this is easily done with basic hand tools. I put mine together in about 15 minutes or so. It is well-built, made of painted steel. Construction is sturdy, and it is a handy size. We fit 2 medium coolers on it side-by side, and secured with a ratchet strap.
Read the reviews if you need more information, but I highly recommend this carrier. It’s great for hauling coolers or dirty / sandy equipment you don’t want to carry in the car.