Here are three types of tongue jacks for today’s boat trailers. The Lift: Hand-crank jacks such as West Marine’s 1,500-pound-capacity swivel-mount model ($114.99; westmarine.com) bolt on or are welded ...

Lippert Power Tongue Jack Electric Trailer A-Frame, 3,500 lbs. 18-Inch Stroke, 5.4-Inch Foot Pad, Durable Textured Casing, Emergency Manual Crank Override, 10.75" Retracted, 28.75" Extended ...