Ranger you will need atleast a 145cfm at 80 psi air compressor for the tamper. I am kind of like you in rural sense. the closer rental dealer here is 30 miles away. They rent a 185cfm air compressor for $85 for 24 hours and the backfill tamper is about $30
The reason I like the air backfill tamper better than the jumping jack,is that you can really work the material under the pipe. Since you have limited access to equipment I would use whatever you can find. Anything will be better than nothing. Goodluck.