Need some help with this mod

[GoranMo]

Hello all, as subject said i need some help with a certain mod, now I don't know is putting mods here without moder consent is allowed, if it is I'm sorry. I have this trailer Dubrava, I really like it mostly because it's widely used in my country and i like how detailed mod is. The problem is capacity. Now i know how to edit it, it is a simple matter but with this trailer not so simple. I want to edit it to carry 40000 of load, but when I do and when i start to load it with crops the trailer starts to lift on it's rear wheels like all the load is going there. I tried to edit trailers mass in GE, it has variable body and I paid attention to edit both, but no luck. If anybody knows how to edit it you don't have to edit it for me, just give me instructions. Thanks in advance

[GoranMo]

This is a link to this mod since I can't upload it here http://mods-hub.ru/fs15/fs15_trailers/f ... -v-10.html