Hi Linda
We have a 93 Aerostar that we tow our 13'
Trillium with. I would think it depends on how many people and how much stuff you take. Our van is starting to get tired also but we are 2 adults and usually 4 teens, extra tents, canoe and all related stuff for 6 people.
Now if there is just the two of you and you pack lightly then you might be OK with a 16', but I kind of agree with your hubby to stick to the 13'.
Nancy