That is a really great idea actually. I think the way that the forum permissions work is we can only dissalow viewing by usergroup and not individual users. So yes they may be able to view eachothers posts but keeping their sales and products seperate might be nice. Have any example sites I can take a look at for ideas?
2010 Hyundai Genesis Coupe 380GT
M&S Type A Front Grill
KDM 380GT Emblem
Korean Custom Wing Badge Emblem
Injen Cold Air Intake
SuperLux LED Tail Lights
O.Z. Ultraleggera 18x8F/18x9R
E&G Classics Full Aero Kit