I think that's pushing it IMO. I have a 18' boat and I used to tow it with a Ford Aerostar with a 4.0 and towing package. Towing it up hills and braking was never a problem. However, it was really frantic towing it on the highway because it was really unstable and on windy days it was scary.
I absolutely hated towing with that van and the furthest I towed regularly was from LA to San Diego which is a 2 hour drive. If your planning on doing 1-5 hour trips I would highly recomend a truck.
Just to estimate with some numbers:
Car - 2200 LB
Trailer (dual axel) - 1400LB
Tools, jack etc -75LB
Spare wheels - 150LB
Misc - 60 LB
That totals up to 3,885 LB not including the weight inside your van (you, other people, fuel)
If you ask me it's a bad idea. You'l be putting your self and others in danger and youl be beating the crap out of your family car.
With the gas prices the way they are i'm sure you can pick up a decent used domestic truck for a bargin.