I have troubles installing trailer mods. i come to the understading that you have to do it manually. I have read the introduction who to do i, yet i have trouble. To install trucks i use SAMI and i works great, but as i tested and read it do not work when i comes to installing trailers. I've used IMG tools but it do not work. When i use at trainer to find the trailer witch it could had replaces the game crashes.. HELP