Can I put 2 ice 75A bec in parallel

[suicideneil]

1. Wiring 2 escs to the same ( throttle ) channel on the receiver is quite common practice and totally harmless, lots of guys running dual VXL setups ( frickin' traxxas v-twin bollocks ) do this.
EDIT: only with linear BECs though.

2. When in Parallel, both BECs will do half the work all the time, regardless of how much work there is to actually do- that's the nature of parallel wiring.

3. See above. Since they are doing half the work, there shouldn't be as much voltage droop under the same load ( compared to a single esc / bec setup ).

4. If one fails, then any number of things might happen. The BEC also often powers the brains of the ESC, so you may experience total loss of power/control on one esc ( flying on one engine ). The remaining ESC / BEC should still be able to power the servos though so you can safely land under power & with full control. Another possibility of having the BECs in parallel is that the dead BEC takes the other one with it- this is certainly true if the BEC that fails send full pack voltage ( ~16.8v ) to the receiver when it fails ( hence lots of dead rxs & servos when some car ESCs fail ), which is ofcourse hooked to the other BEC / ESC.

5. Perhaps, if one BEC has enough current to power all the servos then it might be safer to isolate the other from the RX. Hobbyking sell external BEC's which have a built-in redundancy, 2 BECS-in-one as it were- if one fails the other takes over.