Do you have a picture of the type of truck your talking about? I was under the impression 5 yard dump bodies are around 10' long, which is too short for a hoe. As you can see most backhoes barely fit in a 10 yard bed. My backhoe wont fit in my 10 yard truck. There are flatbed dumps with long beds, but I think any way you slice it you will be over 26k.
Discuss this in the forum topic Need a dump truck that can also haul a backhoe on top of it.