Here are four new cars for UCGO done by Frank "Picto" in early devellopment stage of UCGO in 2008 ("UCO & ABFO" Ancestor of UCGO)
Picto didn't had time to work on UCGO in 2009/2010 but those cars where intended to be released as part of "UCO & ABFO" anyway.
Content:
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-Bus - can carry 15 UMmu
-Mini - can carry 2 UMmu
-Util - can carry 2 UMmu and 1 cargo
-Van - can carry 8 UMmu
-Low poly cars, FPS friendly.
[*]You need to install UCGO addon before installing this one, you can find it here: http://orbiter.dansteph.com/index.php?disp=d
[*]Once installed try the scenario "4 more cars for UCGO - demo gallery"