Is 1,650lbs the GVWR of the trailer or is it the number you've arrived at using a scale?
If the GVWR of the trailer is 2,000lbs or higher, you need brakes. If the trailer wights more than half of the towing vehicle, you need brakes.
If it's only going to be 1,650lbs loaded, you should be ok payload wise on the van, but it can't hurt to double check.
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