Have had 2 of those HF hand trucks for years now. They work just fine. I modified one to carry my Oxy-Acetylene tanks, and the other is for general use, and it gets used all the time. Tires need re-aired once every 6 months or so. Mine are a bit taller than 4-1/2" though
Are they 40 grit?
 
 
		 
 
		 
	 
 
		 
 
		 
 
		
 
			