Indeed, I ran into a group of German businessmen in a similar situation with their little van, and we kept the same pace over the meseta until Astorga. However, they were very civilized about it and bought me drinks from time to time and we had a pleasant dinner in Hospital de Orbigon.
As well, I encountered several groups of picnicers with their cloths spread out and the support wagon carrying their food. Most of these seemed to be organized commercial tour groups-- an elderly friend took one of these, as she was unable to walk for long periods. However, I found that the Spanish picnic groups were very friendly, and I was twice invited to share their meals, entertaining them with my bizarre and surrealistic command of their language.
I sympathize with your position as it can be very annoying at times. However, facing accommodation discomfort is the experience of much of humanity, including millions of refugees, and I was never left without a bed on the Camino. I was furious when a Brazilian pilgrim said to me: "Don't worry, there will be a place to sleep; there will be enough to eat and it will be all right," but he was right. As well as the albergues, there are always rooms above bars and cafés, spartan but comfortable, and people often rent rooms in their houses to pilgrims.