Thanx for the kind words everybody . . . we are at that stage of life where adding value is a prerequisite.
Petdes, I would like the address your queries first due to your limited time before visiting the KTP early August. Sorry for being a bit late . . . we were on a very successful 16-day fishing trip on the Transkei Coast (Eastern Cape). . . with good fisherman's stories . . . backed with brilliant pics as evidence !
# we use the queen size Intec inflatable mattress . . . very sturdy for a big guy like yourself as mentioned . . . and as comfortable as my bed at home ! The more air you put into it . . . the better it will work in your case.
# look after your mattress like your vehicles tyres . . . even inflate it at home for at least a week before to detect any possible leaks . . . even sleep on it one night just to get the feel of it again . . . and then check the pressures time and time again.
# again, like anything else, it will give you good service if you look after it !
# pack it in a tight-fitting cardboard box for the transport on the rough tracks . . . chafing must be prevented at all time.
# I use a thick builders damp coarse on on top of the groundsheet inside the tent. . . . and then I lay the mattress on top of it. (cut slightly a bigger size). You simply go on hands and knees beforehand to dubble check for any thorns on the ground below your tent (and inside !).
# beware of an electric blanket between the mattress and yourselves . . . the condensation of body dampness is so bad at times . . . as a result of the icy cold air in the mattress below . . . and the warm humid air around the body . . . that it could appear as if someone has had a spoil in bed the next morning ! . . . . its not nice to have wet bedding.
# rather put the electric blanket (on the lowest setting) between the damp coarse and underneath the mattress . . . and it will warm that massive volume of air in the mattress from below throughout the day . . . . There is no dampness in either the ground or air during the winter in the Kgalagadi and therefore no danger re the electricity.
# Remember that the cold comes from below in the Kgalagadi. With the warmed air below you when you go to bed . . . you'll sleep like a baby !
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(and refer my pic no 40)