The Avalanche I have has even bigger blind spots. Their answer is to use backup cameras. Seems a lot of Av owners have them. There are two that seem to be the ones most chosen. Follow this link to read about them -
http://www.chevyavalanchefanclub.com...ard,159.0.html
I have ordered the nav cam as it fits nicely in the dash by chance. I post this here so that if the H3 has a similar problem, you can start from the experience of others...