Two capacity is only part of the equation. Since you are already confused I'll add more to your confusion....:?
PAYLOAD is just if not more important. Make sure that once your tow vehicle is trip ready loaded with gear, passengers, the dog, whatever - make sure it has enough payload left over for the hitch and tongue weight of your loaded trailer...
Confused???
It took me 3 tow vehicles to get it right.... because I listened to the dealer and only looked at tow ratings...:S
(I'm a slow learner, but I had fun shopping for vehicles)