Just did my '58 1/2 ton bed with painted pine (POR then enamel) and SS angles, bolts and strips. This is not a show truck!
My opinions on Mar-K bed wood hardware:
A+ : web site, packing and shipping
A+ : polished SS angles, strips, & bolts
B- : pine. 1 board cupped, mixture of qtr & flat sawn. All boards had planer marks and slight dings.
before... plywood with flat metal strips on top:
http://www.filehigh.com/serve/8290/378149.jpg after... MAR-K stainless & painted pine:
http://www.filehigh.com/serve/8290/378148.jpg http://www.filehigh.com/serve/8290/378152.jpg