Those types of ladders do have their usefulness in certain circumstances. However, I used to an aluminum 6' ladder years back and the BWC representative was visiting one of my clients while I was working and noted that they want to see only fiberglass ladders for commercial use. (I like fiberglass ladders anyways) The next day I had a fiberglass 6' with me and my client said I didn't have to listen to the rep since my client had a 6' aluminum ladder as well. The next time I was on site, my client had a fiberglass 6' ladder. The multi-tool Little Giant ladders don't fit the fiberglass category, so I have never bought one. Like others have mentioned, they are clunky to haul around. Instead, I carry on my truck a 24' extension, 10', 8', 6' and 4' ladders. They can't all fit in my van. Only the 4' stays inside the van.
To safely haul the ladders around since I had experienced too many close calls with bungee straps, I searched the internet for a solution. I only found one and it has worked well since 2013. It's called Hook-Um Dano. On the driver side of the van, the 8' stacks on top of the extension ladder. On the passenger side, the 6' stacks on top of the 10'. The ladder rack is a dual side Adrian Steel rack. The 4' stays right inside the passenger side cargo door. The bottom ladders are held in place with the ladder rack. I don't lock the ladders but instead put a bolt in the lock hole just for safety.
The ladders are arranged by what gets used the most. I use the 4' ladder to reach the top ladders. A few times I have needed a 12' ladder but not very often. Anything above that is generally done with a lift. The extension ladder is primary used for service and accessing roof tops.
On a side note, a friend that was a safety inspector for a company said as a policy they didn't allow aluminum ladders. He said this was to the extent that it wasn't allowed on the jobsite property even if it wasn't being used. This was to prevent using it in a pinch.