originally i had thought that the Ultra Legionaire morpher was a low budget Vehicle Force, but now I'm thinking it's Dancouga with the serial numbers removed. just a random thought i thought I'd share.
Caboose: Doc's new goggles help him see at night. I think he is looking for cake.
The two-land-two-air thing reminds me of MOGUERA doubled. Although there's so many "N vehicles become giant robot" that you'd pretty much have to track down the design artist and interrogate 'em to be sure what influences went in. 4-combiners are pretty uncommon, but there's no guarantee any of them were the root inspiration.