The D11 should support any of D* dishes, the one you say you have for it (the non-5lnb one), sounds like the dual LNB (a round dish/single LNB), it is possible the LNB on that old dish is defective, or you could be missing the 101 satellite, could be your coax, and yes, a cheap meter will be fine to find the 101.
You use the D11 setup to get your azimuth/latitude of the 101 (where you want the dish to point to) by entering the zip code the dish will reside in, the numbers it gives you are guidelines to get you started, they are not exact, you will have to make small adjustments until you get the strongest signal you can.
Also, when you transport the D11 to and from the cabin, you will have to re-run the setup, so it sees the dual lnb/round as a dual/lnb round, as it will be expecting the 5lnb (and the reverse when it's time to move it back), you'll have to do this each time you move it.
Going off your neighbors dish won't be much help, since even by being off by just 1/8 an inch on the ground, it really ends up being off 100+s of miles in space.
And the most important thing, is that the pole the dish is mounted to must be 100% plumb, if it's not, you'll never get a good peak.