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Southern Nevada desert | We have run a 7800 ps, a 7810 ps, a 4560 ps, a 7720 pq and an 8120 on hesston 4900 and 4910 4x4 big balers. We almost always run duals and the 78's handle them just fine, a 7810 with duals is better than the 8120 with singles on a big baler. also lots of 4450/4455's on big balers in this end of the country.
The 4560 has been bulletproof, 16k hrs on the original engine and trans and still going but if your small balers are 540 pto then the 8100 and 4555/4560 are not a good fit unless you can find a 8000 series with the 540 option. My 7810 was golden until about 7000 hrs when the trans started giving fits and large bills followed, the 8120 and 7720 power quad have both also had large trans repair bills by 8500 hrs.
As far as operating the tractors on a big baler I would prefer the 7800/7810 over any of the others. I hate the 7720 pq tractor, on a big baler the pto always needs 2 trys to start and it seems like the trans is always in the wrong range, I would take a powershift all day any day for haying, the 7720 also has in general been a glitchy electrical mess as long as I have been around it.
The soundguard tractors are kind of clunky for mounting the monitors and the cabs are smaller but the maintenance has been far less at 16k hours than any of the others at less than 10k hours. On a baler I would rather run a 50/55 series power shift than a 7000 series power quad any day of the week.
Strictly from an operators standpoint I am sort of indifferent to the 8000 series, I find nothing about them that I like better than a 7810 in a big baler tractor and I am just more comfortable in a 7810.
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JD 4455 or 7810
