I've put a super heavy duty trailer hitch and some belly bar brackets on my F-350 to hold the camper. Lot's of big holes through fairly thick steel at awkward angles.
Things I learned:
1) Speed kills (the drill bits)
2) Keep the bit and hole lubed up with Cutting Fluid
3) A drill doctor drill bit sharpener can pay for it self in drill bits on one job like that.
I had a couple of drill bits and found that I could get about a hole and a half. taking sharpening breaks helped both me and the bits get the job done.
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