Characteristics for an American landing vehicle , tracked, personnel (LVTP-6) in March 1961

Dimensions 21.7 x 10.9 x 9.4 feet. Capacity 20 troops with combat equipment cargo water 8,000-land 10,000 pound. Weight combat equipped 24 tons. Maximum speed 5.6 (water)-35 (land) miles.

Source

Army forces in amphibious operations (the Army Landing Force). Department of the Army Field Manual FM 31-12. March 1961.