Need more than a trencher. I need a backhoe.
A cheap chinese non-powered backhoe from Harbor Freight is $2.7K ~ 8ft reach
https://www.harborfreight.com/9-hp-t...hoe-62365.html
Renting a full power backhoe for a couple of days is $720 for the same reach
https://www.sunbeltrentals.com/equip...ft-dig-depth/#
Why rent for a week? because I don't know how to use one and I expect it'll take me some time to learn
Thanks for the input - this project requires a lot of different skills (most of which I'm still developing), so I appreciate any experienced input.