Well. last weekend I did mount the RFM on the TC25 and it powered it fine. Grass was not really in need of cutting but I wanted to get a feel for how the tractor would handle the weight. Its a tad heavy I think and I will pick up some weights for the front, when lifting the mower if I go too fast it pulls the front wheels off the ground, so that tells me I don't have much weight on the front wheels for steering control. I have a few JD suitcase weights, I'll have to see if they will hang up front securely or if I have to find some designed for this series tractor.
Today I hope to get some time to look at the tach and figure out what is wrong there, but that is another thread.