Atwood makes electric jacks. Here is a
Link.
Iโm not recommending this vendor but did notice they show the mounting plate with hole pattern. Not sure what brand you are referring to but they probably also show the mounting plate with its associated hole pattern. I know my Rieco Titan mounts have multiple holes.
Regarding cost, the Rieco Titans are more expensive than Atwood. I too have a negative impression of HappiJack.
'11 GMC 3500hd SLT DRW D/A 4x4 Spray-in, Air Bags w/comp & controls, TL, Superhitch, 48" Supertruss, 9.5t Warn, front rcvr, Fox Shocks, '11 AF 1140, DB, AC, Gen, Solar, Thermal Windows, Wardrobe, Rear & Side Awnings, 18' Lund/40hp Honda 4 stroke