</font><font color="blue" class="small">( The caddy will allow you to safely pull a larger mower with a smaller tractor. Fuel savings anyone! The tractor does not have to carry the weight of the mower which can make some tractors unstable in the hill country. )</font>
I really dont see any of this going to work... I use a 2 meter disk mower on a Zetor 5245 or 6718, but i wouldnt hesitate to hook it up to my little 2011, even though it doesnt have the power to run it at 20 km/h like the others can.
Usually a mower is carried by its slide boots when it is in working position, not by the tractor. All the tractor has to do is keep the mower straight, because it is offset mounted aside the tractor.
If that mower caddy (weighing maybe a 1000 lbs ??) is enough to keep the mower in position without swinging the caddy away, i'm sure any tractor that can power a mower, has the inertia to keep it pulling straight.
Usually the problem with bigger mowers is lifting it off the ground on the headland. Some smaller 80 hp utility tractors tend to break the shaft that connects both short lift arms on the transmission housing, when they carried 3 meter mower conditioners folded down but just a foot off the ground, due to the torsion of the offset weight.
If the mower was really to big to carry on the 3pt lift, i'd get the pull type mower.
I dont see how a smaller tractor would result in less fuel conumption, mowers require quite some power so a smaller tractor would result in a slower working speed, so longer time to mow.