He has probably never had any experience with an older garden tractor.. especially an IH built one.. Those rear ends are near bullet proof. We have a 1450 that has run ballasted 10.50 ag tires and weights since 1976. The tractor has been worked hard all it's life.. heavy gardening and mowing... the rear axle has never given any trouble. I'd rather have the weight on the tires and wheels only.. if you hang the weight on the back you are also stressing the axles and bearings..
His reasoning doesn't make much sense to me...
Ballast those tires all you want and don't worry about it!! 
A modern box store lawnmower with an aluminum transaxle... I wouldn't even think about weight or ballast! 
__________________
Jay
40 years of Using and playing with IH Cub Cadets!
Proud owner of the following:
Cub Farmall, Super A Farmall, Original, (2)70's, 72, 100, 102, 123, 105, 125, 127, 108, 128, 1450, (3)782's, Yellow 982, 1782, "Sam's" 2182, M Farmall and a #7 trailer
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