255/55R19 GG AT3 are only LI 111 whereas the 255/60R19 are 113.  Having read about the sidewall damage to the 255/55R19 I was a little apprehensive about trying the 60 profile version but not once I felt the sidewall thickness prior to them being fitted to the rims.  Even at 30 psi front and 33 psi rear the sidewalls barely bulge under the nearly 3T empty vehicle.
Can you borrow a good 18" rim to see how close your shaving is?  My old 3.0 D4 runs 18" D4 rims these days, albeit with probably with less clearance than the 19" D4 rims on my L322 which is around 3 mm.
				
			 
			
		 
			
				
			
			
				MY21.5 L405 D350 Vogue SE with 19s.  Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
			
			
		 
	
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