Good Morning!
As long as you stay with your current BMT combo, then anything that has a 3500 pound towing rating should do just fine. All total you are more than likely 2000 to 2500 for the BMT so having 3500 pound rating will work fine. Now if you plan on going larger in size with your BMT combo, then I would stay at the 5000 pound rating or go even higher pending the next one you are looking to buy?
From my past experience in automotive sector as a Service Director, it is not the engine as much when it comes to towing. It is the other systems that many forget about needed, to handle the extra weight and heat build up that develops from towing. As such your needs in braking and cooling increase so not only can you safely bring it all to a whoa. But not burn out expensive things like automatic transmissions.
So when shopping having as 3500 pound towing ability is good for your current combo, but I would also check and make sure, that the automobile has a automatic transmission cooler in combo with the braking and suspension system to handle that extra weight? I would also highly recommend, having the factory tow package either factory (preferred) or at least dealer installed. The hitch components really do fit and look much better than you can get most times aftermarket, and the wiring is in place to address the needs of the trailer without cutting or at least making much fewer splices into the auto's main wiring harness.
A good approach to take when shopping for a vehicle, is to look at the accessory catalog "before" even spending a lot of time looking at the main catalog. This and see what in the way of towing related items you can buy? Then compare that to what the sticker may already denote is on that one unit on the lot?
Hope this helps?
Dave
