After attending last weeks MN Green Expo, saw a couple booths advertising their push spray units as a means to trim in very small lawns. Some are ground driven, some are 12V powered units. Some even have a hand wand to use for very tight trim. Have any of you guys used any of these units? What is your though on their place on a guy's truck? I have been kind of scratching my head a bit, thinking maybe instead of backpacking and killing my back on 4k sq ft lawns (I hate lugging 4 gals of mix it just KILLS your shoulders esp. in the heat), maybe something like this would be a better way to go, without having to go to a full out skid. I already use a ride on for lawns bigger than 5k sq ft. Note that I am not talking about Synergy type drop in sprayers. Rather, something like the Turfex unit in the link below http://www.turfexproducts.com/sprayer/push-sprayer/tl80 Thanks!