Not sure where your "rule of thumb" came from, but I'd consider getting another one....I've ran 6' (72" tillers behind 32 and 38 hp tractors for years with no issues. Never ran out of power, even in ground previously not worked. I've ran my dads 84" Howard Rotovator behind 38hp with no problems also.
The track width of a 255 can be set to LESS than 72" if desired.
And, As I mentioned, I've ran my 72" tiller in our clay ground at max depth, even in sod ground, and behind an MF150 diesel. That's the same engine as a 135. No problems encountered. I've owned the tractor since new (1971) and it's never had the first issue with pto. (8+ years with the tiller...
My neighbor uses a 72" Landpride tiller behind a (41hp) Ford 3000 with no problems. You won't find much ground any tougher than the clay we have here.
Personally, I don't care much for MultiPower (in low range) with a tiller. with the freewheeling of MP in low, a tiller will tend to push the tractor.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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