What is the weight of the trailers with Pallets?

Also, why do you want only 6 Cylinder SUVs? If you plan to tow as a job, sometimes a V8 can actually do just as good or better, MPG wise, as a V6. A V8 with higher towing capacity will also likely last longer in a towing job.

I responded to your other post, but I will also ask, do you plan to have people in it?

I ask to clarify what you intend to do with it, and that will help us get you the best answers.

There are substantial complexities ahead of you. If possible, get an SUV that has the "towing package" which usually includes things like transmission coolers. Electric trailer brakes can reduce white-knuckle stopping situations.

This site has some of the key info:

https://www.kbb.com/car-advice/towing-capacity-guide/

1. A professional pre-purchase inspection is your friend
2. Lots of options, but be picky
3. At that price, condition and maintenance is as important than make and model
4. Dont max out your budget; keep a little reserve for fixing unknown problems 
5. youll get a better deal on 2wd than 4