Hi Peter B,
The left tire is at least thirty percent bigger than the right. How is that possible if the pic is taken from this distance? Download the hi resolution photo of the LR pic. Zoom into the rear wheels. Both tires are off the ground. Not only will you will see there are no tire tracks but there a footprints instead (especially right tire) I have also attached a marked photo pointing to the rear axels. One is pointing outwards and the other is much smaller pointing inwards. With regards to the rear antenna (the name escapes me) the antenna normally looks flat. ie the wires are flat, horizontal. The only way you can see this design is from below.
Per the Apollo Lunar Surface Journal, this image was taken with the 60mm lens, which for the 70mm film format is slightly wide angle, roughly equivalent to a 35mm lens on 35mm film or full frame digital sensor. The will translate into a slightly exaggerated perspective.
There's also the fact that the LRV is parked at an angle relative to the camera. That, combined with the slightly exaggerated perspective, is plenty to explain why one side looks smaller than the other.
Both rear wheels are definitely on the ground; the left is resting on a slight rise (like halfway up a speed bump). The LRV is parked on a slight downward incline, and the camera is aimed slightly below the centerline, so yeah, you're looking at that antenna from underneath.