I have a Chevy 2500 conversion van. It is similar to a Chevy Express. The kayak cannot fit inside the van, so is there something I can buy that attaches to the outside? We have an extended cab pick up with an 8 foot bed, but my husband and I and our 4 toddlers with car seats will not fit inside it. How do you bring your kayak along on vacations when you don't have a truck or suv?