Foam filled tires...

[joeu235]

I've seem no flat spots on mine. We already had 500 pounds of weight added to to the front. Many people add much more. I can't see increased wear being an issue unless the equipment is much lighter duty.

 

[9501tts]

Your asking where to get tires filled. In the USA I recommend Wingfoot They are part of BF Goodrich. They have branches in most every state that do tire filling. In Canada Kal Tires. Use only a major company for this service. Small time operators have been known to add chunks of rubber or other stuff to reduce the amount of the 2 part polyurethane that they put in your tires. Likewise, avoid the do it yourself kits, from online sources and the other homegrown procedures. That stuff is junk. It takes professional equipment & chemicals to do it right.