Three and a half tons that respects the lot line.

The U35-4 reaches about 9'9" deep, which handles foundations, drainage, septic, and most utility trenching for residential and small commercial jobs.
It has tight tail swing, so the rear of the machine stays close to the width of the tracks as it rotates instead of swinging out. That lets you dig right along a property line, fence, or neighbouring structure without the counterweight clipping something behind you.
They're close in weight and dig depth, but the U35-4 has tight tail swing and the KX033-4 is conventional. If your jobs are consistently tight to structures or lot lines, the U35-4 is the better fit; with normal working clearance, the KX033-4 gives comparable capability.
It weighs about 8,130 lb, which typically calls for a properly rated tandem-axle equipment trailer and a heavier tow vehicle. I'd confirm the exact trailer rating against your truck before finalizing anything.
Both are available. A cab makes sense if this machine will be run hard through Grey-Bruce winters or long days; canopy is the lighter, lower-cost option for seasonal or occasional use.
Tell me about your property and the work you need done — I'll point you to the right machine, even if it isn't this one.
Tell me what you're working with