You should be fine with that rating.
I would only point out that towing demands more from you vehicle. You don't state the year of your Ranger so if it's older or has lots of miles on it, it may be a good idea to go through it thoroughly by checking tires, brakes, hoses, belts, fluids, etc. If in doubt, change anything that you wouldn't trust.
I would also add a tranny cooler.
4WD is a great feature, but sometimes deducts slightly from the tow rating, and would effect overall gas mileage.
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