Get the largest Blue Tote you can afford and you will need a trailer hitch for towing this to the dump station; if you don't have a TT hitch. I have used my tote for both the black and gray water to empty the 5er holding tanks. A very time consuming process, but easier than breaking camp to mover my 5er. I tow the tote to the dump station behind my truck.
We now have given up on parks that do not offer full hook-ups, 50 AMP sites with our latest unit. In fact the DW comments on parks without pull through sites even and tells me to avoid them if we can. But we can't always avoid them but they tend to be last on the list of camp grounds to use.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67