Get two things. 1) Proper torque wrench. It's possible that whoever last put your wheels on (I assume a Discount Tire or the like) over torqued them, hence the difficulty in removing the nuts. And 2) an 18" flex handle (http://www.sears.com/sr/javasr/product.do?...0&bidsite=CRAFT) or breaker bar or similar, along with a 19mm socket. That'll let you get the lug nuts off without any difficulty.

 

I never have to pull too hard to get my nut off...