You should be fine with a 4x4 but as Gillie says, stopping is the real issue. You'll need surge brakes if you do any towing at high speed on the interstate; many states require them if towed load is over 3000 lbs. (Be sure to use silicone fluid in the brake system, because conventional fluid sucks up moisture like a sponge! That will eliminate any problems with the hydraulic system.)
I've towed my Seafari all over the state with a 4100 lb 2WD Dodge Dakota 5.2L V-8 that I ordered with a 3.55 Sure Grip rear axle, HD cooling and towing packages. It tows great, and with trailer brakes it stops like there's no trailer back there! With 8" wide rims, 60 series tires and the positraction rear, I've never had a problem on steep ramps, but I have a heavy single axle EZ-Loader trailer with a PowerWinch, 31 rollers and zero friction, so I never dunk the trailer, just get the tires wet. However I might need 4WD if I used a float-on trailer where I had to get way down the ramp to dunk the trailer.
A good roller trailer and winch (mine's 28 years old, with original springs!) will allow you to avoid the extra weight and maintenance of a 4WD system in addition to being a nearly maintenance free trailer!
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