I have a jumping jack, hoe pack, and a trench roller. Each serve its own purpose, but gets matched to the job.
Hoe packs have been good for runs in the distance that you describe, especially if there are cleanouts or risers to be concerned with, or if you are in an area where excess spoil generation has to be avoided (2' bucket or less). I run mine on a 303, and they do wear out my bucket bushings. I like them for unstable soils that I really dont want to be down in with a jumping jack.
Trench rollers need a wider trench (I need 32 or wider), you need a machine capable of actually lifting the thing (3000lbs) into the trenches, and need to be re-hoisted over risers, and the controllers can be a nightmare if gotten wet or ran over ( I use carolina electronics for my repairs
http://www.carolinaelectronicservice.com/), but man can they put alot of dirt back hard and fast. I also like them because i can compact a small pad, driveway, or patio far beyond what a plate compactor can achieve, and helps keep a commercial plumbing site a lot cleaner, as I usually make a pass over where my spoils piles had been after backfilling to get rid of any "crummies" that would become slop after a rainstorm. As CM said, Wackers can be found pretty cheap at auctions. I bought a RT820 for $1500 at a Ritchie Brother auction after I rented one on two separate occasions...for $1900 a month, each time using them for less than 20 hours. Old yes, but air cooled Lombardinis that run forever and parts availability ( unneeded so far ) have made it a good choice for me