Is my vehicle ok to tow a 3023?

We are just about to purchase a 3023 and I own a 2005 Honda Odyssey van. A dealer in CA said it would work just fine. The towing capacity on the van is 3500 lbs. which meets the requirements however I am a bit nervous for I live in the west with of course many mountainous areas. Does anyone out there pull their 3023 with a van?

Is length of the trailer a concern with the type of vehicle in which you pull it?
Hoping to join all of you soon with many great memories!

Mary