Spun tires getting up boat ramp

Wear life jackets.

Air down

One trick a lot of boaters have learned to do on a slick ramp, is to apply the parking brake just enough to force both rear wheels to grip instead of just one. If you have a parking brake that's the foot pedal type just hold up the release lever and gently apply pressure with the left foot while apply throttle with your right foot till both wheels grip and you drive up the ramp. With a limited slip differential the power will go the tire with the least amount of resistance, by applying the parking brake your applying equal resistance to both wheels thus doubling your available traction.

Carry a tow strap, check before backing in some area's are clear on the same launch. As was said here, be careful many ramps here in Ct. the concrete has a big drop off. Real trouble if you back off of that. Putting down sand sounds like trouble, from fellow boaters.

Not knowing what chassis we're talking about here, but you could consider replacing the differential with a Eaton Detroit Truetrac.

:):)

Bagged play sand would be okay not sand from along the road or a sand pit.
In some states the natural resources people may frown upon sand impurities polluting their lake.

The front hitch idea may be the least problematic, if possible.
I pretty regularly can spin tires on a ramp with my F150 trying to get the 3,500 lb boat out of the water. Far worse if there is an undercut on the end of the ramp due to people driving their boats up onto the trailer.

My only solution - put 'er into 4WD, which is one of the many reasons I got that. Of course not an option on yours....

You could consider softer, heavily lugged tires - something for mud and snow, etc. But that may hit your gas milage, ride, and not wear as long.

Carrying sandbags is an option. Both for the weight over the rear axle ( a proud tradition in all of our cars back in the day here in the north country), but you could also spread the sand under the tires to get more grip....
Or there are light weight metal grates that go down in front of the tires, to help reduce slip. Although in snow, I've seen those sometimes shot rearwards, which may not be what you want with a boat behind.

The ultimate - trade-in, and get a 4WD pickup, with a camper back!

I had this experience with a friend in Peterboro, Ontario. His boat was a 21' pulling with a Lincoln and the ramp was very steep. I had a tow strap in my car and hooked to his front bumper. It didn't take much to get it going with a little boost from dry pavement. This was back in the early 70s.

Other than having four wheel drive or the front hitch that Cobra21 suggested, there isn't really anything you can do about it. Both the 4x4 and front hitch keep the drive wheels off the slick areas. If necessary, you can probably ask someone with four wheel drive to pull the boat out of the water and onto dry ground for you. Most people are very accommodating.

Is it possible to put a front hitch on? Would this keep the drive wheels out of the slime? This is what I have on my C rig and so far, so good.

Brian