Its true.
With the 38 special, you already have the big part of the machine there with the mini, if you can still fit the stumper in your existing truck without cutting into your available cargo space too much to necessitate a second trip.
Market and type of work dependent. Personally, I'm not heavy on removals, and there are a lot of people that just don't want the tree falling on the house, and don't mind the stump.
If a person does a lot of removals, it might fit the business plan well.
My set-up wouldn't make me $150/ 20 minutes between loading at home and securing, unloading at jobsite, working, reloading and securing, and unloading at home. I wish. That's good money if you can do it that fast without an extra vehicle.
Brendon, where will you transport your stumper? I've seen your 1ton pics with the mini sideways, but not with enough room for the grinder, IIRC.