I have had some made for local clients. 
The 30mm thick I would not have considered as 'bridging' ladders but work great in sand and mud, and most that smaller lighter 4wds need. I carry a set on my camper, partly as rests for the tyres when on soft ground for levelling etc, and have used them in sand (actually on Big Red, recovering a Series 2). 
I have used my set of 38mm ladders to get across a gully, and they easily handled the weight of my loaded RR, bent a lot as the weight of the vehicle was in the centre, while only the ends were on solid ground.
Horses for courses I am sure, but these are much more rugged than the plastic MaxTrax and like products.
				
			 
			
		 
			
				
			
			
				Michael T
2011 L322 Range Rover 4.4 TDV8 Vogue
Aussie '88 RR Tdi300 (+lpg), Auto (RIP ... now body removed after A pillar, chassis extension to 130 & fire tender tray.)
			
			
		 
	
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