I imagine this is somewhat relevant -- for several years I've towed a 13' Scamp with my 4 cyl. 2006 Toyota RAV4 whose towing capacity was 1,500. The camper is 1,200lbs dry so add a few hundred on top of that. You can see both in my profile photo.
Had no issues and it towed nice and smooth even up and down hills. It is a must to make sure you have trailer brakes and a brake controller installed, IMO. A mechanic installed one for $100 so it wasn't too bad. Electric brakes on the camper really help slow things down going downhill, that's the biggest issue.
As for MPG, I'd lose around 7-8mpgs down from my regular 22mpg. Not too shabby all things considered.
Since the van has a more powerful engine than the RAV4 I had and your camper is almost the same weight as mine I don't think you'll have any issues.
After a few years I "upgraded" to a Nissan xTerra w/4WD so I could go off-road otherwise I would have kept the RAV4. Interestingly, with the bigger engine in it I've found no loss in mpg towing the camper on relatively flat terrain.
Ray
PS. You may want to see if it’s recommended to install a transmission cooler for your van to extend its life when towing. That is if it’s an automatic.