Spent this spring/summer getting the bus ready to spray foam. Before getting bids I shot ~50 small cans of foam, filling the hard to get places (above the windows) and filling deep areas below the windows, in several lifts. I masked off the entire job ready to spray....
Got 3 bids and hired a local guy with 11 years in business, his bid was just over the price of DIY kits. He did a great job, adding about 1 1/2" - 2 1/2". After I shot another 30 small cans to touch up a few angles he could not get to.
Big step for me getting foam done before the long winter, I'll be able to work away nice and warm inside.