References:

US Amphibious Ships and Craft by Norman Friedman

AE 21 Suribachi Class

10,000 tons Standard
17,500 tons Full Load
512 ft LOA
72' Beam
20' Draft
16,000 SHP Steam Turbine, 1 Shaft
20.6 kt top speed
325~ Crew
7,500 tons of cargo

Weapons
4 x 3”/50 Twin Mounts (Two Bow, Two Stern)

AF 58 Rigel Class (Modified R3-S-A4 Design)

7,950 tons Light
15,540 tons Full Load
502 ft LOA
72' Beam
29' Draft
16,000 SHP Steam Turbine, 1 Shaft
20 kt top speed
115~ Crew
4,650 tons of cargo

Weapons
4 x 3”/50 Twin Mounts (Two Bow, Two Stern)