If you use the stakes lined up in a trellis configuration and connect them with a webbing of twine then the bean vines would have something to cling onto as they climb. This worked well for me last year (pole butter beans), sometimes the young vines need some help in finding their direction but easily done by hand to get them started wrapping them around the twine.

^^ Good suggestion. Wonder if they would just climb straight up the poles without any twine/fishing wire (I'm lazy...)

very doubtful plus you would only be able to plant a couple plants next to it without crowding.

^^ I've got quite a few of these 8' poles, I would probably put 2 plants around each pole.

I think the idea is to get the plants to spread out so they intercept more sunlight. Growing up one pole practically guarantees that a lot of the leaves will be shaded. Need some sort of trellis. Teepees are sell-supporting trellises but, like you say, one side of the plants (facing inward) is not very accessible. But webbing with twine or chicken-wire is the way to go.

I'm using this mesh this season: https://www.johnnyseeds.com/tools-supplies/trellis-netting/hortonova-fg-79%22-x-250-9716.0.html attached to 8-ft T-posts. I've used something similar in the past with cucumbers.

I've done the teepee, but was disappointed with the waste of space and the spiders inside of the TP!

I don't have pics, but my hubby built a frame in somewhat a shape of a #7, but tilted the other way. I strung jute up and down and criss crossed. I was able to use the rest of the 4x8 raised bed for things that preferred a cooler growing area (lettuces etc)

I use a double row of poles. They are put in at an angle and connected along the top by a ridge pole.

One of the best way's I have seen is using pruning' s off of trees for supports. The bark on the limbs is rough enough for the tendrils to grasp and climb to the top. Fruitless Mulberry works great for pole beans and You can tie some other pruning's like peach or apricot to the poles for snow peas to climb. If you have a large enough area ! When they are done either save them of toss them in the brush pile. Best part is these things are free