If you intend to bury PVC pipe in a area that has a lot of traffic (tractor or otherwise) and/or ground engaging equipment then a trencher is the best bet.
A middle buster trench is way too shallow for serious pressure pipe burial IMO. Plus, unless the soil is perfect, a shovel is necessary to clean out the ditch as the spoils will often fall back into the ditch. Gravity is not friendly for this application.
I just helped my neighbor put in PVC pipe to drip irrigate 50 redwood trees (they require a lot of water). He plans to flail mow the "orchard". When the ground gets wet here it turns to putty so a tire could easily sink and break the pipe.
Anyway, he bought a trencher at auction, we rebuilt and serviced it, then dug a tremendous amount of trench about two feet deep with cross ditches for the drip line to come out at the base of the trees. Under no circumstances would a middle buster have done a satisfactory job.
Bottom line: If you are going to lay water pipe in your vineyard it would be advisable to get the line deep and out of harm's way. There is a lot of necessary traffic in a vineyard and your
M7040 is heavy enough to sink in a wet spot. It will get out but repairing the damage is a detriment.