shaggs

i have found thick welders gloves (like gauntlets) are good for those pesky palms. dont forget the darn weight of those things when you quote....they're friggin heavy.
treestyle...metal pickets are ok. proper ones are metal rod about 1m long. each one driven 2/3 in at 45 degree angle (opposite to load) in firm ground will hold approx 350kg's.
ekka is thinking of a combination 1:1 which is 2 pickets driven in about 1m apart and lashed together with rope. (clove hitch, 6-8 raps, 4-6 frapping turns then clove hitch). this should give you 700kgs.
you can add to your system 1:1, 2:1, 3:2:1 etc.
some use a metal plate, 1200mm long, 100mm wide with 6 holes along it. drive the pickets thru the holes and place a D shackle at the end. you can add to this also.. "in line, "V" shaped etc.
if you plan on using the same pickets all the time, offset weld some steel near the end so you can hammer them back out, paint the tops yellow for safety and keep some vice grips in the tool kit to "twist" them out!!!!
cheap, easy portable anchor.
good luck