I agree, the sway damping is the deal.  I don't really need the weight distribution part of my Andersen Hitch.

Example:

RAM 1500, 3.6 Penstar engine standard axel ratio = 5000 lb tow capacity

Same RAM with 3.55 axel ratio ($95) = 7730 lb tow capacity 

I get so many folks like the Load Leveling Hitch and I won't Say say use or not use, just be aware of what you're doing and the effects created.

To you GW, I'm surprised you have one! I have a Taco (vs. your Tundra) and today I hauled an hour away with just my new sway bar. Stopped a couple times to play with and adjust and driving normal, 60-65mph. I was going to my dealership for yet another issue, another thread.. Once there we had a good conversation about the sway bar and learned I still wasn't tight enough for the highway. So as I reached the highway I adjusted. I found it ran awesome.

What I learned today (and I'm open to other interpretation) is sway is only really required for highway speeds. There are no major turns involved. Here's where the sway does does best and should be set lighter when running byways (typically decent turns in the road).

I am finding I like this sway only more as I learn more about using it properly.

The Load Leveling Hitch, at least mine, doesn't give me this adjustability.

My mechanic checked it over and agreed, My Taco sits proper with just sway.

Just what I'm doing. 

I should have added that I use an Anderson weight distribution/anti-sway hitch when towing with my Tundra.  I like it and very much appreciate the sway control.

I also have the Toyota tow package on my Tundra.

I also moved my spare tire from the back to under the trailer in front of the axle by using a BAL Hide-A-Spare.  This is an effort to move more weight forward of the axle when the water tank is full and improve the trailer handling even more.

Look closely when buying and thinking tow package.  On the 15 Chev Colorado, w/o tow package the hitch ball is in the bumper and rated 3500. With tow package the hitch is attached underneath bumper to the frame and rated 5000. Plus you get all the wiring done. I also think you get a different rear end ratio. For about $300 back then, it was a no brainer.  

I use a $80 sway bar and with a full load of water (tank behind axle of my 178HRE), and a bit of loading thought to keep weight on the tongue, I have no problems, no real sway with the Colorado.  One thought, as I have done numerous I-70 mountain passes with this -- down shifting and brake capability is important. TV + R-pod is about 2/3 GVW of Colorado 12,000 rating.  In the mountains I would say my comfort level is very good, but would not want to push the GVW% any higher.  A vehicle with 3500 and a lower GVW max would be a concern on steeper grades.  On the flat plains, not a concern.

My experience says that the tow rate(pounds towed) is not necessarly the same as the overall tow package.  The tow vehicle might easily pull the weight, but what damage is it doing long term to the tow vehicle?  The trans cooler and  oil cooler are designed to protect the tow vehicle , not necessarily enhance its towing weight capacity. The extra strain on the tow vehicle can be mitigated by enhanced features that the tow package offers.

My opinion is that most tow packages are well worth the extra cost for the enhanced protection of your tow vehicle regardless of the poundage required.

Vann

I have the SR5 V6 with Tow Package. I wouldn't go lesser. Also wouldn't pull 7K with it. I try to size my TV to be at least 25% greater capacity then what I'm going to tow. The rPod (182g) is 58% of the Taco's tow rating. Great matchup!

Take Tundra out of the mix.. I don't know why, but Toyota just blew it on the Tundra. This comes from a guy that loves his Tacoma! 

Just look for something that can handle ~~ 5000 lb towing capacity. All of the above have models/versions that start in that vicinity. Some go way above 5000 lb.

It is kind of a double-edged sword in a way. The WDH will reduce the overall weight on the the rear axle of the tow vehicle, and distribute some to the TV front axle, and some to the axle(s) of the TT. In the process, it puts a significant amount of stress on the TV hitch and the associated frame members the hitch is attached to. I think one major concern of mine is the effect on a unibody vehicle, and whether the rear sheets of metal are strong enough to handle the torsion (and weight).

If Offgrid has taught me anything, it is that this is not weight distribution. The weight upon that tongue is still on that that tongue.

I fall into the group of not using that mis-named hitch and going sway only. 

At any rate, unless you tow the trailer empty with no accessories or baggage, that is how you should gauge it. 

Off hand, I would guess that your Sorento will be overloaded.

Frank