the pic of MPH with 2 strands should give a clue. mine run against 2 strands year round on 20 acres i lease. the tape does not pack well but is the most visible. i pack the string on a ski rope winder because i can get more on it and a couple of winders will almost cover an acre. a note- i cut my fence and splice with knots frequently and knots do degrade the continuity of the power. just saying.
i put one strand about knee high and one chest high. low is necessary because they hesitate to cross low wires if there is a second chest high. i dont mind ankle high even, if necessary. high wires will get many [ mules especially] ducking under, hobbles help with the duckers cause they know they might get lit up half way under. some of this is due to the nature of equines pushing or fighting against any pressure or pain.
there are few fencers available now that run on D batts. you can carry a small gel cell, like for game feeders if you wish, but D cells will run for weeks. the fencer i used to use got smoked by lightning and i cant find another. it held six D cells and was a hot one. the ones that hold 4 D cells dont seem to nearly as hot, power wise. i have not used the double D batt fencer but am suspect of it being enough. just a hunch.
there are kits sold at many farm stores that will do it all, but all need is wire and a fencer. a spike can be your ground or if you forget that just dig a trench and bury some wire for a ground. keeping the ground rod wet helps in sandy country, too.
i have carried a roll of wire and cut a branch to wind it up many times. some of the kits have a spool in them to roll up the wire but it looks rather bulky to me. since i done have one i cant comment. still the kit will get you everything you need. a fence tester is not a bad investment for the size and weight, either. [ unless you can get your bud to do the testing] and dont test with rubber shoes- do it barefoot, after all they got four ground rods nailed on their feet.
i dont carry posts back into the high country but have them at the truck. i just string the wire rope through the bushes with no insulators at all in camp. if trees are spaced right you can use hay string to tie the wire to and it will insulate the fence. for a gate i tie a stick to the wire and loop it over the wire on the opposing side. bungees are a good idea!
