would help us ALOT more if you actually explained what you actually modded/did to the vehicle. you want us to read your mind? you want us to log onto your computer to see exactly what youre talking about.
The bucket truck's node count is different from the bare chassis, so just copying the nodes and beams from it won't work. You'll have to use the Node Renumberer tool to fix this.
You could also remove the bucket from the bucket truck using the same tool, which honestly would be easier.