Integy T10 winch with remote

[Cossett]

Hi guys, I have a question on the Integy T10 Realistic High Torque Mega Winch w/ Remote as Im mounting it to a trailer to haul a truck onto it.
-What is the smallest battery I can use with the winch with out decresing power to it ? ( the battery will be mounted to the trailer )
- The three way switch thats on it ( on / off / on ) reverses the direction the motor winds the cabel depending the position the toggle switch is in ?
- is it true the toggle switch acts like hi / low power depending on the position ?
-Also what is the max weight it can pull without burning the motor out ?

Im new to crawler parts and these might sound like dumb questions......

Cheers Tracy