get the Barker 32 gallon with 4 air filled wheels.. easy to pull to truck. over gravel/sand/grass...
at Edisto beach state park the dump station is over 1 mile away.. on pavement.. the air filled tires are great on pavement or gravel even at 20 mph. others are not.. as many plastic wheels failed there.
there customer service is second to NONE..
the side valve is very handy... do not try to assemble the hose that comes with it.. get one already made.. not same as hose from trailer to sewer pipe.
like $15.00 at Camp World.
we have 40 and 40 tanks. 3 times a week to dump station.