I was going to suggest you ask John Walravens to work out the power to weight ratio you might need,but I note he has already commented.
IMHO I really dont think you would be advised to use brushless motors,as I feel they are more for speed,and that is not one of your requirements?
In my model of her,There are four old fashioned,but very reliable Renault car heater motors.I dont think they draw a lot either.These give me the performance required,and a little bit of speed should I need it to get me out of trouble.You will not need anything of this size,if they are still available,but I maybe talking out of my er hat,but I would have thought ordinary brushed motors of the Torpedo type would suit?
Mick F