50 Foot 30amp cords ?

I park my 5er near my garage in a certain spot as its the only one that it fits in. I am going to have an electrician come and put a 30amp fuse in my panel and an outside box/plug in the corner of the garage closest to the trailer. Im not quite sure if a 50ft ext will make it so I was wondering if any members have every chained 2 50 ft extensions together and did it work ?

I know the general rule of thumb is the longer the cord power lost I just want to make sure the AC will still run with a cord that long.

Thanks