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Sounds like you may not fancy this option but I had a similar problem on my van when I bought it. It took an age for the kitchen sink to empty and glugged as it did and it drove me mad. when I took a proper look at it the waste pipe as yours is it was badly perrished, so I decided to put a solvent weld domestic 32mm waste system on it. the result is I now have traps under my 2 sinks and they both drain very quickly.

I have the outlet near the wheel for the reasons you pointed out and I have a few different lengths of pipe to slot into the outlet elbow depending on the slope I'm on.

For the shower I left a short length of flexi and fed it into an upturned fitting which is on its own leg of pipework to stop anything backing up as someone suggests might happen. I hoped that open end would act as an air admittance to stop any vaccum problems and it seems to have worked. one of the best mods I've made I think and well worth the effort.

The down side is it cost me about £60 with traps and new sink wastes.

How about joining the 2 sinks together - not the shower or you'll flood the caravan.

I moved outlets from the back to the side behind the axle, cut down the length of run and because the kitchen sink was at the opposite side managed to achieve a respectful drop by mounting the outlets on a wooden block.