Having towed our 2500 lb pop-up camper for 5 years with our 2006 sienna, I would not go any bigger in weight or height.
In my opinion; anything larger is pushing the limits of a safe combination.
We ended up buying an F150 before graduating to the hybrid and I am glad we did. A much safer combination for towing.
Things to keep in mind if you do decide to tow anything with the sienna:
1. Make sure you have a tow package, if not get one. (Transmission cooler, etc...)
2. You will need to get a break controller installed if the trailer is over 2000 lbs (cargo included).
3. Make sure the hitch receiver you have/get is really rated for the tongue weight. Our factory one wasn't.
4. Fully read and understand all the cautions in your owners manual starting on page 394. Exceeding these could cause a safety hazard for you and others around you. These numbers and calculations can get confusing so if you have any questions just post them here and I know that some one will be able to help.
5. In regards to what you can tow, don't believe anything that the RV sales person tells you. I am not saying that they they all lie, but it has happened in the past.
I don't want to be a downer, but I do want you to have a safe and comfortable camping experience.
3Wheel
