When I bought my coach in 2008 I had tire wear similar to what your pictures show but not as bad. Also had a bad vibration in the front end. Rig had ~50K miles on it.
So I knew I needed new front tires and needed to have my alignment checked but where. So I called Buddy Greg of Knoxville and tried to make and appointment there but they didn't do alignments, OK "so where do you take big rigs when they need an alignment" and they gave me the name of an alignment ship. I made an appointment.
Got new tires put on and took it right to shop. The shop owner got in the shop right away and checked and came in and told me he had to bend the solid front axle. I gave the go ahead and they pulled out a big cast mechanism that the rigged up the the axle with heavy chains and used a hydraulic ram to bend the axle. Not sure if they had to do it twice.
But when the were done there was no front end vibration and the tires wore evenly side to side. Got ~55K miles on the tires but had to change because they were aged out.
So if you can find a good shop that knows what they are doing and say the have to bend the axle consider letting them do it. I did