I like to look at it this way... Say you have a livving room in your house... and u have 2-3 couches in it.. then u have a super bowl party... and invite your 200- 250 pd friends and each couch sits 3 ppl.... PLUS that amazing 50 inch plazma screen tv PLUS the weight of the furniture... ... SOOOO some rough math here... lets go on the low side just so ppl don't ******....
2 couches at 100pds
6 big dudes at 200 pds
big screen tv at 400 pds
(2x100)+(6x200)+(400) = 1800 pds
THEN... your team wins the superbowl and YOU ALL GET UP AND JUMP UP AND DOWN SCREAMING.... JUST POUNDING ON THAT FLOOR.... exciting eh... well that floor didn't fall through...
What im trying to get at is... concrete or not... houses are strong... they survive hurricanes (sometimes) and not to mention those 600 pds guys that don't get outa there beds cause their legs won't support them.... I think yer fine getting a big a.s.s tank...