YEP, I always wanted front & rears set as wide as possible. A new 6610 Ford set wide & had 4" rear wheel spacers . It had a rear 3 pt. 84" flail & right & left mid mounted Mott Interstater flails (18'6" Cut total). Anytime on a steep slope I'd raise rear mower a couple inches off ground & the same with the up slope mid mount to balance weight on all tires. On pull type rotaries there enough weight on the drawbar most times, if not raise mower just off ground than maybe might stay straight behind tractor or slide sideways if on steep slopes.
Some counties run duals which would widen the tractors thread width.
And yes, I have slid sideways down slope a few times.....than to make another angle of approach.
Like Jacka said above... slow on slopes....