the general structure is
到+some place +去+(do something)
then let's see the sentences~
1.我到后边的车去,可以吗?-------it doesn't sound correct to me ,车is something ,not someplace,so it's better to say :我到后边的车那里去,可以吗?
2.你不是到台湾开汉语教学研讨会去了吗?-----it's correct
3.我真想到你们家乡去学学滑冰。--------it's correct