Lift em up - I don't know who makes em but there are certainly small stands out there for display so your tyres don't flat-spot. I have a few cars built for display tho the only one on display is my original rc10.
I can't say I've done anything to protect it really - it's had oil in the shocks since I built it about 12-14 years ago, and it's never leaked. Most of that time however it was in a box filled with foam stuff, so it didn't have weight on the wheels.
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