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Edit:
Just ordered a new galv bumper to go on as well as the old one is slightly bent, and of course crusty. I was considering a military style one but I don't think they're worth paying twice the price for so standard galv it is with stainless bolts.
I'm not a big fan of stainless bolts in that location.
Stainless comes in may forms, A4-70 is approaching 8.8 steel in hardness and strength but all others are as soft as brass. You can easily shear the head off an A2, M8 stainless bolt with a standard 13mm ring spanner, a one handed operation with a socket and an extension bar.
In the event of a 'bump' the bolts will just shear like a scissor cutting through cardboard.
If someone tried to use the bumper to pull you out of trouble the bumper would get/fly off at the first pull.
Use a minimum of 10.9 HT steel or even better 12.9 High Tensile bolts.
Lather everything with a waterproof grease during and after assembly and it will last for many years