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It depends. The motor is no problem really. Oh, and BTW 12,000 lbs is 6 tons... 
The key to your 150 mile range is the cost and weight of batteries. You may find that your range requirement pushes you up to the 16,000 lbs you mentioned. Rough rule of thumb is 8Kwh = 1 gallon with respect to range; if your land pig gets 10mph, then going 150 miles will require 8 x 15 = 120Kwh worth of batteries. You're going to need deep pockets for this safari....
Welcome to the forum, now go do some studying (EV Information). Good folks here happy to help with the technical challenges.
The key to your 150 mile range is the cost and weight of batteries. You may find that your range requirement pushes you up to the 16,000 lbs you mentioned. Rough rule of thumb is 8Kwh = 1 gallon with respect to range; if your land pig gets 10mph, then going 150 miles will require 8 x 15 = 120Kwh worth of batteries. You're going to need deep pockets for this safari....
Welcome to the forum, now go do some studying (EV Information). Good folks here happy to help with the technical challenges.