Joe, when I built our barn I ran 1” black poly pipe to the barn and several locations for water troughs. Little deeper then yours about 4’ this was in northern Virginia.
We don't have the frostline like you and others.
At 4 feet, the only thing considerable would be a ditchwitch.
They have them for rent at the homedope, but I couldn't quite justify the cost, or yet another trip to town.
Tonight my body is sore, and my brain hurts.
My body from digging and crouching, my brain from the wife.
She does stupid little things lately, that are no big deal, such as starting the coffee machine, but forgetting to put the pot under it.
They aren't major, yet, but they are getting somewhat more frequent, and a bit costlier.
Yesterday she went to town for her monthly meds, and a few of them are crucial. Like flat on her back without them crucial.
Fortunately we get a little help from the state, but one of her monthly meds is an injection that runs $900 a month.
Today was burn day for the trash in the fire pit.
She brought hers out from her office area and threw it in.
Guess what?
She tossed in her new bag of meds.
This will prove interesting come Monday morning when she has to explain her brain fart to the pharmacist.
Arrrgh.