We used direct bury triplex. 2,2,4. We are aslo required to ground back to the source just not a ground rod at the load end, so that was 6 wire. So 4 wires total. We were supposed to step a size down at 1000ft according to the electrician, but we didnt and it worked fine. Cost was 1.18 a foot. Not real cheap but you never have to worry about leaks and I installed that way faster and cheaper than a 2 inch line. Used a small 1.5 to 2 hp vac pumps and electric releasers with deep well submersibles. We tested them and the start load was only 19 amps. Shortest pump is 300ft longest is 2000ft with a 70ft rise in the middle. I am doing more and more of these if the power is available. These are also on monitoring systems and remote starts.