would you be keeping your T6 or having to sell it? i converted mine at 123K after selling my T5 that was on 230K, my brother had a T4 and as much as i enjoyed the simplicity of it there is no way i would go from a T6 all the way back to a T4 they are practically agricultural in the way they drive compared to a modern T6. you know the history of your van, you dont know the history of a van you may buy or the conversion history, atleast if you do your own van you know who has done what and when.