Not an RV park at all ,
but i uselly go to the Macey's ,and park infront of the loading docks area ,security kind of provided ,
at the WestField SouthCenter Mall in Tukwila .
5x405 .
best way to get a TT in ,is from the exit 1 off the 405 .
(then keep to the north on southCenter Blvd ,and Left & go under to the Tukwila mall pkwy)
if you get to the 18% up hill sign ...don't take it !