5th scale on road car based on 1/8 buggy parts

[simplechamp]

Buggy based on-road 1/8 have a ~325mm wheelbase and the buggy based with truggy chassis (IGT2) have ~360mm wheelbase. I would think trying to make a longer 1/5 from buggy arms might be too narrow, maybe 1/8 truggy arms would be better if you wanted to start stretching the chassis even further?