Possible or not?!?

[Glenn and Lorraine]

Yes, So long as they are "E" rated, you could use the TV's tires on the Monty. The 245s will be a bit wider and a bit smaller in diameter than the 235s. This should not be a problem. Both sizes carry the same load capacity of 3420# at 80# PSI.
I had an 04 2955RL and had thorouhgly check out that possibility and saw no reason that they wouldn't work. Your 2980 would have been built on the same frame.