Re: 2006 Mercury Mariner - couple of questions
Towing package adds a transmission cooler and class II hitch, so you can handle 3500lbs, over the standard 2000lbs with just a hitch on a 2wd V6. Be cautious as you'll want to use trailer brakes over 2000lbs, check state laws.
I can't speak for the traction control, but you can phone the dealer with your VIN and they'll tell you what the vehicle came with from the factory. Keep in mind, they might have to submit this info into Ford, and a response may take a couple days.
Generally, if the dash light comes on, and you can match it up with a photo of something similar in the owners manual, then you more than likely have traction control. Check around on the dash as it might have an override button to defeat it. Traction control helps to proportion power and braking power to any given wheel(s) when required to keep the vehicle on course and to keep the driver from doing anything stupid (err, having any fun!).
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!