Chassis drawings for a 1999 Isuzu NPR HD

[Triggerfish]

Hello everyone. I am designing a composite panel camper box for my 1999 Isuzu NPR HD. The truck currently has a 12' delivery box which will be removed leaving me with a bare frame. I REALLY want a cabover extension, while keeping the tilt cabin functionality, but I am having trouble getting good measurements of the chassis and cab in the tilted up position. Do any of you know where I might find detailed drawings, or better yet, a 3d model for a 1999 NPR HD? I'm not having much luck. My drawings for the box need to be very accurate, as ordering the panels is an expensive endeavor and I need to get it right. Thanks you!

 

[SkiFreak]

I don't know about the Isuzu, but the Fuso drawings do not show any of the swing angles of the cab, so you might be hunting for something that does not exist.

While you still have a box on the back of your truck, use a straight edge and a tape measure and take your own measurements, using the box's roof as your datum.
Personally, even if I did have drawings, I'd still be taking physical measurements, just to confirm that the drawings were correct.

I have seen a few examples of people's builds where they have a Luton peak over a tilting single cab.
All of those builds involved quite a bit of complicated engineering and involved either a tilting section on the camper box or a removable floor in the Luton peak that allows for the tilting of the cab.
One interesting approach was to use a dump body mechanism, that tilted the entire camper body. From an engineering perspective, that approach was probably the most sound. A detachable 3 point mount, of sorts...
Definitely not a simple engineering task, but it's definitely been done before.

 

[The Artisan]

Hello everyone. I am designing a composite panel camper box for my 1999 Isuzu NPR HD. The truck currently has a 12' delivery box which will be removed leaving me with a bare frame. I REALLY want a cabover extension, while keeping the tilt cabin functionality, but I am having trouble getting good measurements of the chassis and cab in the tilted up position. Do any of you know where I might find detailed drawings, or better yet, a 3d model for a 1999 NPR HD? I'm not having much luck. My drawings for the box need to be very accurate, as ordering the panels is an expensive endeavor and I need to get it right. Thanks you!

I have an 07 fuso and the overhang will have to be really tall to clear the arc. 2 ways you could do it is have a seperate popup section on the cab that you could access from the main pod or make your pod slide backwards when you need to get to the engine.
Kevin

 

[Triggerfish]

I don't know about the Isuzu, but the Fuso drawings do not show any of the swing angles of the cab, so you might be hunting for something that does not exist.

While you still have a box on the back of your truck, use a straight edge and a tape measure and take your own measurements, using the box's roof as your datum.
Personally, even if I did have drawings, I'd still be taking physical measurements, just to confirm that the drawings were correct.

I have seen a few examples of people's builds where they have a Luton peak over a tilting single cab.
All of those builds involved quite a bit of complicated engineering and involved either a tilting section on the camper box or a removable floor in the Luton peak that allows for the tilting of the cab.
One interesting approach was to use a dump body mechanism, that tilted the entire camper body. From an engineering perspective, that approach was probably the most sound. A detachable 3 point mount, of sorts...
Definitely not a simple engineering task, but it's definitely been done before.

Thanks for the reply. I purchased a drywall t-square and got some help with measuring. I was then able top bring the measurements into CAD to help with modeling.

I am intrigued by the removable floor idea for the over the cab extension. The cab on my Isuzu NPR is not nearly as wide as the camper box would be. A removable floor would allow me to tilt the cab when needed for actual maintenance of the engine. Interesting.

I have made contact with a local fabricator who makes custom flatbeds. He's confident that he could make a subframe that could tilt. I like this idea, however, overall, the removable floor seems like a great way to go. Thanks for that idea. Have you seen examples of this? Send a link if you have. Thanks!

 

[Triggerfish]

I have an 07 fuso and the overhang will have to be really tall to clear the arc. 2 ways you could do it is have a seperate popup section on the cab that you could access from the main pod or make your pod slide backwards when you need to get to the engine.
Kevin

Sliding the box backwards... that's a very interesting idea!