Here is a real (troubling) post form another site that people will read and jump to the conclusion that this vehicle shouldn't tow a darn thing. You go ahead and find the flaw in the logic here. Sunbeam, you will love the last line.
"My wife and I purchased a new 2015 Highlander XLE and were planning on traveling across the USA. Having the standard towing features, heavy duty radiator, oil cooler, trans cooler, heavy duty battery, etc, we did all the research to find that we could tow 500 lbs hitch, 5,000 lbs total. We ordered a new Forest River travel trailer with specs showing 468 hitch, 4200 total. After having the best Curt hitch installed professionally, I found that Toyota had made no pre wires for electric brakes. In addition to having to completely wire the car for a 7 pin round connector, the trailer dealer had to spend hours wiring for electric brakes. My electrical bill not including the hitch was $650!!!
Everything turned out to be a disaster! When I picked up the special ordered trailer a month later, driving home dropped my gas mileage from 28 mpg down to 8 mpg, without even any cargo! In addition, even having the BlueOx distribution hitch, my front tires were coming off the pavement while driving down the road. We tried to sell the brand new trailer back to the dealer but the answer was no, we shopped buying a larger tow vehicle (a Tahoe) but the trade difference was $22,000. We tried to trade it to another dealer for a smaller travel trailer but was told that the only trailer that our front wheel drive Highlander should pull should be a pop-up camper being very light weight. We were told by an expert that our 4,200 lb travel trailer would burn up the Highlanders transmission and engine as the rpms were very high when driving the rig 60 mph.
Long story short, we sold the brand new trailer, never plugged in at a $1,200 loss and are still very upset with Toyota for advertising 500/5000. This is deceit on behalf of Toyota. To prove my point even further, the law states that if you pull a trailer over 2,000 lbs, you must have electric brakes. However, Toyota makes NO pre-wire at all for electric brakes. Also, a trailer with electric brakes will nee a 7 pin round plug and Toyota provides the pre-wire for only a 4 pin. In my opinion, Toyota Motor Co. Should reimburse me the $1,200 that I lost.
DO NOT buy a Highlander to pull a trailer over 2,000 lbs or you will be sorry.
Thanks,
Charlie, in Georgia"
Maybe the manufacture's weight of an empty trailer (another discussion entirely) was not the best ending point for a tow vehicle purchase decision.