There have been some days that if I didn't have 4WD on my Dakota, there would be no way I could pull my 22ft pontoon boat out of the ramp. I've seen lots of people smoke the tires on the slime until they got traction enough to get out of the ramp and they were white with fear when they made it.
Granted there should be enough space between the slime and your drive tires most of the time, but, you have to be careful. If you hit that stuff, it's over.
That would ruin your day.
If you are launching at a dry ramp, not too steep and not too much weight on the trailer, then you should be fine. Otherwise, exercise some extra caution.
Also, don't be afraid to ask for some help. More than once I have been asked to load or launch a stranger's boat at the ramp because they either showed up with the wrong tow vehicle for the conditions or the conditions changed since they launched on a dry ramp in the morning. Slipping them a fin is a nice way to say thanks too. I wouldn't take it, but you never know!
Pay it forward everyone. You never know when that good karma might be needed.
Safe travels all!