Possible wiring scenarios:

1. Using a 3-to-2 wire trailer light converter, tail/stop/turn functions can all by handled by the oval bulb. The converters are small enough to tuck behind the trim and are about $10 on Amazon or eTrailer.com.
2. Using a “Split-Oval” (half red/half white) the red portion can be wired as tail/stop, and the clear section as backup lights.  A round amber blinker can be added below.
3. Red Oval as tail/stop with amber turn signal below.  Reverse lights wired to auxillary bumper lights, if installed
4. If LED bulbs are used (recommended), an LED flasher module may be needed as well.