For me GT's work the best over table tops, i have already broke one in half and broke off 2 sets of the side skis. A word of advice don't lend forward to much while in the air, my friend did a nose dive 3 days ago a broke his wrist.
if you really want snow for your back yard go to a skating rink with a half ton and lot the back up with the snow that the zambonie (i think thats how it's spelt) brings out hell i do it all the time and they never stopped me
i'll be wearing my TMC hoodie it's slick look it it at www.tmcmogul.com/ just go to new threads and click TMC ACCESSORIES and it is the TMCWORX it is at the bottom right corner