I just put some Falken Ziex S/TZ-05 All-Season Radial Tire - 305/50R20 120H on my 02 cclb max. But I'm finding out these are only 4 ply? It's camping season and my camper is about 10k with all our supplies in it. I'm questioning these tires because of the ply but how can a 120 load rating be so low of a ply? My 245 stockers were 120 load but a 10 ply. Am I in need of different tires asap or am I not seeing these are higher ply and or just over thinking this? I'm so use to going by ply instead of load index in not sure what to do. Money doesn't fall off trees so I hate to buy another set if I'm just paranoid over this. Any advise would help because I have searched this and haven't found a clear answer. Thanks