I have the 3.7L pulling my tires which are around +25-35lb's heavier per tire than stock. However I also have an air intake, throttle body spacer, stg2 jet chip, and exhaust/muffler. Its a little faster than stock and has noticeably more torque than stock, if I didn't have those I would be struggling. I would rec. going to les schwab or equivalent in your area and asking them their opinion, some stores have let me try on a pair of used tires in their inventory before I actually purchase them and let me run a drag or two up and down the road. This isn't very common, though I've bought enough sets from the same store for all my vehicles so they let me do it.
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07 3.7L. 12000K HID, 3000K HID spotlights, K&N 63-1545 Intake, Airaid TBS, NGK Iridiums, Flowmaster 50 series muffler, Stage 2 Jetchip, Daystar 2.5" liftkit, Spidertrax 1.5" spacer, Toyo Muds 265/70/17