I made an ambulance from scratch from multiple vehicles since there is no base Z3D models for sale and everything works fine except for one thing......

 

The texture shows up fine in OpenIV but shows up messed up when you first spawn it in game (In the ambulance slot). You have to spawn it twice for it to show up normal. 

 

The ambulance spawn without any issues when you rename it to another slot. 

 

What is causing this and do anyone know the fix????

So I have found the problem. one of your files for the texture is corrupt. I have been having the same issue and did some digging. After you have installed it into open IV the file name ambulance+hi.ytd when you go into edit mode and double click this, in open IV the texture ambulance_sign_1 needs to be deleted as it is causing the trouble you are having. my texture was all screwed up and this textured was corrupt it ahs since been perfect and working on the first time. hope this helps. I added some pics so you can see as well. love the content. keep up the good work.

Thank you and yes I figured it out last night as well and you're correct. I'm fixing it now and will be releasing more too notch content for you guys.