I have used my Westy to pull a U-Haul trailer with a piano inside. No
problem. I wouldn't try hauling a big trailer, but it doesn't sound like
you need to do that.

Last winter, I had to use the Westy to haul firewood...I was getting used
pallets and other freight lumber to burn. I had the interior filled,
crammed, with fir and oak pallets, and had the roof racks piled with them
also.
If anything, the ride was smoother!...and I didn't ever have any feeling
that the Westy was overloaded or dragging. I could still have been in 4th
at 35 on the level, but ran in 3d because it felt better.

Get the Westy, and be satisfied, instead of the Caravan.