Algema trailer tire problem, who can help?

Hello people I have an Algema car transporter AT 2008 from 1986. Yesterday I burst on the highway one of the 4 tires. Now I just wanted to buy a new tire today but because of ……………… The size 180/70/R8 is no longer available, only for forklifts, the tire is no longer produced. Now I have read that it would be possible to have the trailer re-tread on 195/50/10 but I need other rims .. now follow the next Pro blem, I can get rims but only in hole circle 5×112 and I need 5×140, middle hole 94-95, ET -4 Did someone ever have such a problem or know help? I can’t scrap my trailer just because a tire is flat