There is the Hanebrink bike which uses the fatter wheels on both front and back: https://www.electricbike.com/hanebrink/
Here is what that review said about the extra fat tires in sand:
"I own several sand bikes and have had much experience riding electric bikes in the sand. With the Surly Pugsley, I have to ride across soft sand just to get to the hard-packed wet stuff. The Hanebrink is the only bike I have ever ridden which has the capacity to ride easily on the soft sand on the beach. That is because it has 8-inch wide tires, it virtually floats on top of the sand. It is necessary to reduce the tire pressure for ultimate traction when riding on soft sand. This is a drawback, because those big fat tires on the Hanebrink would be a bitch to pump back up, if you had to do so by hand when you were going from sand to road."
He also said, "At 1000 watts and above the Hanebrink is the funnest electric bike I have ever ridden."