The sled push on race carpet is a different sport

Every gym sled I've pushed glides. Then you read race reports and it's the same story: people hit the carpet at the venue and the sled barely moves. The friction is the point, I get it. But nobody really trains for it, because almost no gym has race carpet. So, rant and question in one: where do you actually train a realistic sled push? Turf, rubber floor, a sled loaded heavier than race weight? And has anyone found a gym that's honest about how close its setup is to race day?