How do I hookup two different crawler brushless motors to one receiver?

[Lil Giants]

In my build, all four esc's have to work together, so I twist all the blk wires (grd)together, all the wht wires (sig) together & use one red wire (BEC power) from one esc & terminate the other 3.

Your build, the two esc's are doing two different functions, so each servo lead should be on its own channel, but use only one red wire & terminate the other from its servo plug. Choose the esc with the highest BEC rating to power the receiver. And yes both tx switches controlling the esc's should be 3position for forward/neutral/reverse.