^This. Get the 40.The last time I ordered a dumpster it was the same upfront cost for the 10yd as the 40yd. I just went with the 40yd, didn't cost anything extra for the space I didn't fill.
Also I see those trailer frames for sale in tact with axles and tires on CL. Farmers for example can use them. I have see them for $800 to $1200. Just a thought.