Ditto with Terry's input.
One consideration with the cube van will be how the chassis and cargo box are configured.
Some will have a pass through area from the driver's area into the cargo box and others will not.
The reason many of these units were built without the pass through areas was due to carrier rules regarding Hazmat loads. Some carriers require a sealed bulkhead to carry Hazmat freight.
Yes, it does afford an owner more load opportunities, but trying to sleep while straddling two bucket seats is not very comfortable; especially considering the limited number of Hazmat load offers.
Additionally, most of the "in stock" cube vans sitting at dealerships seem to be on a chassis with dual rear wheels. You will want to make sure that such vans are rated below 10,001 GVWR.
Cube vans are also the least aerodynamic of the bunch; hence, reduced fuel economy. Moreover, if they are on chassis with dual rear wheels that configuration will also decrease your fuel economy.