You need to read your minivan's towing specs carefully. Many towing capacities don't include passengers; if yours doesn't you'll have to subtract their weight from your towing capacity. Also, I would have the unit weighed before you purchase it - many 'dry weights' don't include certain options. Those two things alone may push you close to your limits before you've loaded any equipment. Does your minivan have a maximum cargo carrying capacity? Tongue weight plus 5 passengers is another place you may exceed your limits.
A 2800 lb hybrid is going to be fairly small. Have you looked at floor plans? It might be a challenge to sleep 6 comfortably.
Dan
