decent price see if you can get them tot hrow in a starter package for free.
Water hose sewer hose etc.
MAKE SURE YOU DO a very thorough predelivery inspection before PAYING. Horror stories are abundant of people finding a problem after paying and waiting up to six months for the problem to be fixed before being able to use the rig. Ever system should be functioning when you do the inspection. No excuses from the dealer allowed. No further payment till fixed.
There are predelivery inspection forms available online if you need one.
Are you sure your tow vehicle will handle this weight trailer? Do not take salesmans word. What about a hitch?