I had a 2WD with locking diff and good mud tires for a number of years. It was ok, but nowhere near the positive traction of a 4WD when needing to pull a load from a stop up a steep slope. You might get by if you carry a bag of sand in the back to help out your rear wheels on those slick ramps when the tide is low and your back tires are on the slick part. As mentioned above, the front wheels are usually on better traction on the boat ramps and this is where 4WD will always win.
Had a situation last year or the year before pulling out with a friend's boat and vehicle. His rear wheels started to spin on the slick ramp and I told him to put it in 4WD. He informed me he didn't have 4WD. We worked on improving traction on the ramp for about 10 minutes and got it out, but it would not have been necessary with a 4WD.
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