Re: 2003-4 6 cyl Hyundai as a tow vechicle?
I bought a New loaded Crystal blue 2002 Hyundai Santa Fe LX 2.7 V6 4WD 4 spd. Auto, back near the year end, Drove it for 3 1/2yrs and 87k trouble free miles, got 20-24mpg around town, 24-30 on the highway. It was the Best vehicle I ever owned! sorry I traded it in. (with the still good original tires!) It was semi-plush, nimble, smooth riding, good handling. and (just right) middle weight, 3700lbs although was very roomy, & compact, but looked bigger. Much nicer riding then a tinny Escape, and much cheaper then a compable Toyota Highlander, also. The factory stock rear axle ratio was 4:56 gearing. It was peppy, but no hot rod, I never towed anything with it, but towing was not it's strong feature. It was basically a good people, & luggage mover.
I don't know the model you're looking at, but in later yrs (right after this) they offered the bigger more powerful 3.5 V6 & 5spd tranny, in some models, definitely a stronger motor, but not quite as good on gas.
I traded for a New Nautical blue 2005 Hyundai Tucson LX 2.7 V6 Auto. 4WD a coupla yrs ago, with a few more features, because weliked the Santa Fe so much, and it rides a bit harder (more sporty), though not uncomfortable, we actually like the Tucson even more, and although the drivetrain is similar, we are not getting as good a milage, with 25mpg max? and it is a bit hard on tires, don't know why on these 2 issues?

aside from that at 58k miles, it's been trouble free!
And I have started towing a boat this year with it, (been towing a big jet ski for a few yrs, no issues). The boat is a 19' Bayliner bowrider Ski boat with a 125hp Force motor, & a Venture trailer )about 2500lbs) It appears to tow the boat better then I thought, in fact better then my 96' GMC Sonoma 4.3 V6 Auto (Chevy S-10 clone), but braking is an issues on either vehicle. I'd say the Santa Fe should be able to tow the boat you have easily if it's the 3.5motor, not so easily with the 2.7 motor. But, you do have deeper gearing then the Tucson both with the 2.7 motor, but with taller tires, I would think if you had to, you could go to a lower profile 60 series tire, for some extra Grunt to tow! at the expense of slightly lower gas milage. By the way, here's a Pic of a boat I picked up ,& took 600miles from Pa, to NC, for my son, in the spring, that was even heavier then my boat, And my boat in tow, Good Luck, Mike