ok, looks like group only works for full (United) accounts, Nation Forever does not support the groups :(
best way, post your login name, so we can add each other, and if you use steam, also post your steam account :)
I also uploaded our old Legion car, it still works in TMN:F:
http://starside.de/legion/Legion.zip
Do not unzip, just put the complete zip file into ".../my documents/.../trackmania/skins/vehicles/stadiumcar" - for nations it might be .../Carcommon" instead.
Also other people won't be able to see it, until you have an united account.
Steam: [HA]Icewolf
TMF: icewolfs
For starters, some small sliding tricks:
http://www.team-dignitas.org/articles.php?id=67
cu starside
Ice