On a trailer, it doesn't matter (performance wise) on which position you mount them. In a nutshell, mount them so as to make installation/bleeding/maintenance the easiest for you.
The only reason you see them in different positions on vehicles is where the outer tie rod pivots fall. If the steering tie rod ends mount in front of the axle centerline, the calipers will be towards the back of the rotors. If there are tie rod mounts behind the axle centerline, just the reverse. Rear calipers can be installed any which way.
Performance cars, like Lamborghinis are a whole different engineering story. I won't bore you with any more details.
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Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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