Rack weight limit for roof

[Robojeeper53]

Older 98 Grandby with the original aluminum rack rear of roof. Approximately 3x6 Any one have idea what would be the acceptable weight to put on it with roof closed of course. Thanks for any experience or input.

 

[Black914]

Back in ancient history I had an '85 Grandy with the luggage/boat rack and used it to haul enough siding to build a small shed. Been trying to recall it's dimensions but there were probably at least 6, 4x8 sheets.

 

[Jon R]

I don’t know but the manual for my 2021 Grandby with Yakima full length tracks says limit the total weight on the tracks to 150lbs.