I have a trailer with 215/70/15 inch tires. Two of the tires
constantly goes flat over a period of about a week. I went to tractor
supply and bought a 14/15 passanger radial tire tube yesterday.

Is there a good way I can take this tire off at home and install the
tube and tire without a professional tire changer? I have done it on
the small 4.80 wheels, but nothing this big.

Ir is this impossible and I am asking for trouble?