My L4060hstc with R4s is set with a 72" (6') track. It's been a while since I took a tape measurer to it, but the sidewalls might be an inch wider. I believe they can go a hair narrower. But as 6' is a good round number that matches impliments I had the dealer set them there. I'm happy as I should have clearance for chains on the rears if I ever need them (my old
L3200 had non-adjustable rims & needed spacers if you wanted chains). Also the new machine feels way more stable with a 72" track over a 60" track, despite being a fair bit taller. Not sure if I'll ever go wider for more stability, but no way I'd go narrower, even if it makes me more manuveraable.
As far as power... my old
L3200 had 2,500lbs moved by 32hp. It ran a 5' rotary well & my 7' flail well, if a bit slowly (same acres per hour on each mower though). The new
L4060 is 5,000lbs and only 40hp, so worse power to weight ratio. I can really feel that lack of power on hills. I tried a
L3560 & found it way underpowered. I'd like more power than my
L4060 mostly for mowing & roading, but it's what was in the budget & does well.
The
L3560 also only has the small loader. I have the medium loader on my
L4060 & almost find it lacking. It lifts 1890lbs or so & could probably do it feeling stable with no 3pt ballast. My
L3200 was rated to 1,200lbs & I probably went several hundred lbs over that. With excessive 3pt ballast the back end was barely touching the ground. Basically the smasll loader on the grand Ls is going to be disappointing, the medium loader is ok. To get the big loader you have to step up to the
L4760, which only has more HP & slightly bigger tires than the
L4060.