Spun tires getting up boat ramp

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.