Mountains and their local effects on Earth's gravity I was once a truck driver and can feel the inertia and kinetic energy on heavy loads while traveling. While climbing mountains in the Rockies I noticed gravity was different on the side of the mountain and was easier to climb about half way up compared to the base. Is gravity changed by the mass and density of the mountain to were it may pull at an angle away from the center of Earth?

 A: Mountains do affect gravity, but mostly because they are high and therefore farther from the centre of the Earth. Googling will find you many articles on the subject, for example this one from New Scientist gives a nice discussion of the subject.
However, while the changes are easily measurable using the appropriate equipment they are too small to be felt by people and far too small to affect the performance of your lorry to any noticable extent. The lowest gravitational acceleration on Earth is 9.7639 m/s$^2$ and the highest is 9.8337 m/s$^2$, which is a range of only 1%.
A: While there are distortions of the gravity field, and the upper part of the "gravity lines" will probably bend in principle they way you drew them, there will be no difference that even the most sensitive rock climber could feel. I'm writing "probably" because the mountain granitic lithosphere has a lower density than the asthenosphere, which means that you will also have effects in the other way, so I think the lower portions of your lines should rather bend the opposite way. 
