I checked all the small v-bases on Tankland: none have the problem. I only see it on small v-bases on CraterMA.
(Now if you pick a fast vehicle, like a Jeep, and accelerate too fast, fly off the ramp, and roll your vehicle, then yes you can fall through the ground, but that's a different problem that can happen anywhere. The original problem happens no matter how fast you are going, and only coming off the small v-base ramps in CraterMA.)