You just made that up.
No. I’ve traveled through various communities where large(r) farms operate and have seen absurdly large grain carts on county roads where they shouldn’t be. People turn a blind eye because they’re farming communities, but the truth is, all that weight on a single axle is well outside of any road specification, much less any bridge spec.
Steel wheels? Not really a huge issue. Crushing the road foundation? Yea, that’ll become an issue in time...
BTW, should you doubt the existence of a 1,000 bu cart:
http://www.brandtpmc.com/index.php?option=com_content&view=article&id=5&Itemid=11
Sorry, one more link for your perusal:
http://epdfiles.engr.wisc.edu/pdf_web_files/tic/bulletins/Bltn_002_Vehicle_Load.pdf
Heavy loads that aren’t distributed crush the road foundation. It’s a real problem in areas where massive loads go through. I became aware of the situation when I’d sit in county government meetings and we’d be talking about why we were having to fix Route thus-n-such *again* when it seemed as tho we forked up to fix it only five years earlier. The reason was massive mining equipment being moved over the road - I’m talking of loads that ran upwards of 130K+ lbs...