I was looking at the skill DB and saw the skill was "active" but when I went to test it turned out it wasnt working, it seems the packets werent coded, I know Rytech has other priorities (like the amazing job hes doing finishing rebel skills)
Its 90% Based on Hercules & rAthena release of the skill so all the credits go to their respective devs.
I used r826 as base for the patch.
Requires 2015-08-26 or newer to work.
Screenshot using 2015-10-29a
EDIT: After thinking about it, I came to the conclusion its better to define on mmo a variable for maxcarts (even closer to rAthena & Hercules code) in case in the future we get the option to add custom carts without replacing existing ones (i know its hard coded on the client but still... who knows) or in case Gravity adds new ones. So I added the "v2 patch".
[r826] Cart Decoration.patch
[r826] Cart Decoration v2.patch