The limiting factor will be your payload (1050lbs). You need to figure out the weight of all your passengers and cargo that you put in the SUV first. Keep the cargo to a minimum by putting as much as possible in the trailer. Once you know the weights going in the SUV you subtract that number from your payload. What's left is the available payload for the hitch and tongue weight.
For example, if your passengers and cargo weight 450lbs combined you have 600lbs remaining for the tongue and hitch weight.
Most trailers average between 12-15% of their loaded weight to be carried by the tongue and WD hitches are around 75lbs. If you were on the low end at 12% it would mean a loaded trailer weight of around 4400lbs.
600lbs - 75lbs = 525lbs
12% of 4400lbs = 528lbs
Some of the weight will be transferred back to the TT through the use of a WD hitch but you'll be pushing the limits with a TT over 4500lbs loaded weight in this example. Just 2 light passengers you might be ok up to 5k.