Don't most people run the bigger 550 motors? If you're running a 540 (like the X12) then 4.5 - 7.5 does sound a low wind for pulling a big truck, it would certainly draw a lot of current. However if you're managing to damage the batteries I would have thought the motor and speedo would also be very hot.
Has the motor got a lot of cooling? I can't understand how it could be draining enough to cook the batteries without getting hot itself.
2300-2500mAh over 6 minutes isn't a huge amount, the latest batteries should certainly take it.
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