Based on the available information, the Rio Bravo Boat Takeout boat ramp is located in New Mexico. It has a latitude of 36.29190408100004 and a longitude of -105.78295546199996. The type of boat ramp is not specified in the given information.

The width of the boat ramp is also not specified, so it is difficult to determine how many boats can be launched or retrieved at the same time. It is recommended to check with local authorities or the facility manager for more detailed information on the boat ramp's specifications.

The Rio Bravo Boat Takeout boat ramp services the Rio Grande, which is a river that runs through New Mexico, Texas, and Mexico. Therefore, only watercraft that are permitted on the Rio Grande are allowed to use this boat ramp. This includes canoes, kayaks, and rafts.

In conclusion, the available information on the Rio Bravo Boat Takeout boat ramp in New Mexico indicates that it services the Rio Grande and allows watercraft such as canoes, kayaks, and rafts. However, more specific details about the type of boat ramp and its width would need to be obtained from local authorities or facility managers for more accurate information.