For loading the Beaver before a trip, we park the MH on the dirt roadway (dead end street) in front of the house. It has a slope of 2' from the rear to the front axle. So I have made a gravel pad to elevate the tag and drive axles 2'. If you can't change the slope of your driveway, you can try using pressure-treated boards; they'll last longer. I think its very important to support all tires and the full width of each tire when using blocks or ramps.
Good luck!