Roller gate track

[jd6110]

So I’m bolting down some 75mm x 6.5mm flat wit 18mm round welded to it to run gate wheels on. It’s in to farmyard wit no major traffic maybe 6 trucks per year. Question is 700mm spacin either side of round adequate Boltin down wit 12mm diameter anchor bolts?

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[vinnie123]

Tough one ! What has more strength? A pair every 700 or staggered at 350? Not sure of the answer but I would have thought either should be fine .