I have a question concerning a mid-engine VW trike. I know some people who have built them and they have used 2 different methods. The first involves using 2 transaxles in line with each other, while the other method uses a single (older model) transmission with the axles reversed. Is the first method used simply to make a longer wheel base? The reason I'm asking is because two people I know used that option and had nothing but problems, while the ones that used a single unit reported that they operated flawlessly.