Not only do you need to consider the distance between the fence, but also the setback from the road and the length of the home + toter.
The best information I could find on mobile home turning radius and sweep paths was from a university of michigan study below. Check out pages 50-54...hopefully this provides some rough guidance.
http://deepblue.lib.umich.edu/bitstream/handle/2027.42/965/82457.0001.001.pdf
Worst case you can remove an endpost for a move to get the extra clearance needed - these 3 rail fences are pretty quick to assemble and disassemble, but digging a post out might not be so much fun.
