Those wood grained door panels are like gold too--when the doors on my '72 K5 got stolen,the local GM dealer searched the country for a NOS pair to replace mine,and could find only one in OK on a dealer's parts shelf gathering dust...I was told no more exist...they may make reproductions now,this was 1984...
I hate mud too--the kid I bought my '77 GMC K2500 from buried it good several times evidently--I tried multiple car washes,pressure washers,nothing took all the mud off,once our clay hardens up here,its like concrete...worst mud was at our local landfill,back when you had to drive up a huge gravel bank to dump your trash--let that stuff dry on your wheel wells ,you would have holes in them,the stuff was nasty from all the trash & garbage,like mud with battery acid!.