NH 1049 Bale wagon questions

Ok, our current "want to try project" is a self propelled bale wagon.  The 1049s are in our $$ range.  I've read on here about the high priced tires.  Does anyone have a source for the actual replacement tires?  Some have replaced them with duals, any specific things that have worked well?  All our fields are on the same farm so highway travel isn't an issue.  

 

I've looked online at parts and most seem to still be available or things that could be shop made.  Am I missing something there?

 

Jeff is comfortable running the pull type so the basic bale wagon operation learning curve has been gone around  

 

Thanks,

Shelia 

NH 1049 Bale wagon questions