does anyone know how much weight a 100 series roof can handle ?

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The owner's manual on my 2006 says not to exceed 70 kg or 154 lbs on the factory roof luggage carrier. This would be the weight of just the tent and no occupants. Once the tent is set up I am sure sure the roof can handle more weight. The point is not to load anything onto the roof that weighs more than the recommendation because it can affect handling while driving.
 
You have to consider static vs dynamic load. The 154 lbs recommendation for the factory rack is likely based on a combination of the strength of the factory cross bars and effect on driving.

I wouldn't hesitate to put a 4 man tent on an aftermarket rack. You may be upwards of 800lbs when people are in it (which im certain the roof can handle), but only like 150-200 when driving.
 
I'm attaching a after market a frount runner rack 74/48 I know it will handle my 225 lb but I was wondering how much more weight I can attempt?
 
Depends, you need to find out how the rails mount under the roof top tent. Does the roof top tent attach to the roof rails or the crossrails? If crossrails, then you'll more than likely have to buy some stronger crossrails (thule, yakima, etc).

My CVT 3 person tent needed to mount to crossrails and I ended up buying some yakimas.
 
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Yes, just attach it to the side rails and you should be fine. Don't attach it to the factory cross bars.
 
The roof itself is rated for 440 lbs dynamic weight. Your chosen rack and tent will be fine.
Wow, the static weight load must be incredibly high with a serious rack (such as Gamiviti)...
 
Wow, the static weight load must be incredibly high with a serious rack (such as Gamiviti)...

Think about the structural rigidity needed in a roll over to not crush everyone inside.

I dont think you could overload the roof itself unless you were trying to carry another hundy, but then again, the roof should be solid enough to hold the weight of the vehicle itself.
 
Think about the structural rigidity needed in a roll over to not crush everyone inside.

I dont think you could overload the roof itself unless you were trying to carry another hundy, but then again, the roof should be solid enough to hold the weight of the vehicle itself.
Good point, never thought of it like that...
 
The roof itself is rated for 440 lbs dynamic weight. Your chosen rack and tent will be fine.
Interesting, Im not a physics guru, can you explain how "dynamic weight" comes into play here? BTW Where did you get that number?
 
Roof of a 100 can handle more than one would imagine. A couple of my favorite ones-

IIRC it was estimated @2700lbs loaded by Home Depot:eek:

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And then there is this local guy with this one owner that offers stadium seating on the fly. And yes if you want to know, he can really drive from above with full controls.


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Interesting, Im not a physics guru, can you explain how "dynamic weight" comes into play here? BTW Where did you get that number?

Dynamic as in when the vehicle is moving. I'm not sure where that number comes from, but any number toyota gives for dynamic is not based on strength of the roof. Its based on safety when considering raising the center of gravity.

The static load (when not moving) is more than you could ever want to load. Really, the limiting factors for static load on the roof would be distribution of the weight and more importantly strength of the rack. With a good aftermarket rack, such as gamaviti, which distributes the load across 6-8 different mounting points in the drain channels (structural point of the roof) you could load more weight than you would ever want to.
 
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