The 25K, 30K and 40K 'HD' models are designed to afford maximum hull support while keeping a low profile appearance. This design allows for easy access to your vessel because of the open span between the drive units. Standard to the 'HD' models are fully adjustable "I" beam bunking systems to gently cradle your boat. Four worm gear driven winches positioned on top of eight pilings raise and lower the vessel. An elevated outside walkway allows access to both sides of your vessel for easy cleaning and maintenance. Remote controlled switches with upper and lower limits are a standard feature.