i only want 4 110v lines maybe.for now i just need 2 110 outlets for lights and a heater maybe.

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I would still put in 2 circuits . I dont think you
can do it much simpler than what I have, but I run
a fair amount of stuff(if I want, in the LQ), I got
all of the stuff at Home Depot
1 out side receptacle box, male plug for the box
1 4 circuit breaker box with breakers
some wall receptacles and a box of romax and 2 sticks
of conduit with a coupler
EDIT
Heres a pic of my cargo area, my breaker box is in
the bottom of the cabinet