Trenton, NJ to Ricketts Glen SP, PA

Going on I-80 crossing Delaware Water Gap to Rt 42. Looking for suggestions because of the 4 mile, 18% grade from Red Rock. Don't really want to ride north to Dushore and then back south to entrance. Driving a Forest River Lexington and towing a Honda CRV with 2 bikes/2 kayaks. Unhook in Red Rock? Do the long route? Just go up the grade? Or is there a better way? Thanks