That much weight you would need a 100hp plus tractor to handle it safely, even bigger if slippery. You braking is not much of an issue, but you get the sap sloshing around and that size load will push you right off the road if you don't have a tractor of equal weight or bigger in front of it. I farmed for 35 years and hauled a lot of sap with tractors, it takes much bigger tractor than you would think to handle that size load safely, remember you only have brakes on 2 wheels to stop it.
Sugaring for 45+ years
New Sugarhouse 14'x32'
New to Me Algier 2'x8' wood fired evaporator
2022 added a used RB25 RO Bucket
250 mostly Sugar Maples, 15% Soft Maples. Currently,(110on 3/16" and 125 on Shurflo 4008 vacuum, 15 gravity), (16,000 before being disabled)
1947 Farmall H and Wagon with gathering tank
2012 Kubota with forks to move wood around