@M4R4. In addition to reducing tire pressure somewhat, a suspension seat post would make riding rough pavement or a moderate off-road trail a lot more comfortable. The Kinekt 2.1 suspension seat post seems to be consistently rated at or near the top by most owners. My wife and I have the Kinekt 2.1 aluminum suspension seat post on all of the four ebikes we own. That will really improve your riding comfort and take away a lot of the harshness of riding a stiff hard tail aluminum frame ebike. They are expensive, but you can get a 20% discount if you order through through Selle Anatomica by entering their discount code at checkout.
The KINEKT Aluminum 2.1 Seatpost from Cirrus Cycles is now sleeker than ever. KINEKT effectively isolates your body from surface vibrations and impacts.
selleanatomica.com
If you decide to get one, I found it best to order with stiffer / heavier springs, that way you can adjust the preload without reducing/losing much travel. If you are near the top of a weight range, order with the next heavier weight range springs.
The Selle Anatomica adjustable leather saddles are really nice and super comfortable too. I have the H2 on my Vado 4.0 and really like it.