I think you would be fine with either of those. You will be well within spec. They build those vans pretty beefy. 3000 lb of payload, 4000+ lb rear axle capacity. 8600 lb tow rating.
What it comes down to is expectations of power. Some people don't mind hanging in the slow lane letting the rig work, while others want major power on tap so that they can accelerate like they are driving a normal car.
I am not trying to win any races and as long as you aren't, you will be fine with those trailers, just watch the temps and make sure they stay within spec and let the rig work and do its job and it will be fine.
1998 Chevrolet K1500
2005 Keystone Hornet Lite RSL