I tow a camper trailer with mine. However it has also towed, pallets of paper on a dual wheel trailer, a huge portable crane, and a Terex digger. Does all it's tow jobs with aplomb.
3500 pounds I take it. About 1500 Kg (1.5 tonnes). Should do it easily. My 2003 3.5 V6 auto is rated to tow 2.4 tonnes. The heaviest I've towed is about 1.8,9. Towed it easily although you certainly knew it was there.
I have a CURT Class 3 receiver hitch, ball mount with 2" ball & a CURT plug & play pigtail wiring off of my 2003 Sorento I'm looking to sell... According to JC Whitney part #'s it should be the same hitch.
The whole bundle for (Edit due to looking at JC's current pricing on similar items) $150 plus shipping. If interested I can provide pics, etc.