Gooseneck Mount (#3220) Aluminum Gooseneck Mount SAE Certified 14" tall base 24,000 lbs GTWR 4,500 lbs tongue weight Gooseneck Mount - Toolbox Version (3220TBX) Aluminum Gooseneck Mount 14" tall base 3.5" base offset accommodates for truck beds with a tool box 24,000 lbs GTWR 4,500 lbs tongue weight Lowered Flatbed Mount (#3221) Aluminum Gooseneck Mount 10" tall base 24,000 lbs GTWR 4,500 lbs tongue weight Lowered Flatbed Mount - Toolbox version (#3221TBX) Aluminum Gooseneck Mount 10" tall base 3.5" base offset accommodates for truck beds with a tool box 24,000 lbs GTWR 4,500 lbs tongue weight Rail Mount (#3200) Steel rail mount fits industry-standard rails (Rails sold separately) 11-1/2" tall base 24,000 lbs GTWR 4,500 lbs tongue weight