When I started trapping back in the late 70's I used the rebar and angle iron stakes. I carried them all over the place when running my line. I hated carrying all that stuff but its all I had. I quit trapping when I got married as there was no time with all the family obligations. This year I started stringing a little steel. Boy, the advacements in equipment have changed. I wish I had cable stakes back then. I used them this year and love them. In fact I think I'm going to just buy the cable, anchors, and other parts and just make my own as it looks to be cheaper. As for holding a fox or coyote I see no problem.
go with cables they are easier,,lighter,,,,and less expensive. plus if you go with rebar your gonna need 24"s for yotes. if you have to carry your trapping stuff into any place the wieght alone s*cks trust me cables are your best friend as i can not drive in the farmers fields. i have to pack everything in.