where is a good place to mine coal fast and not have alot of people in p2p? i wanna mine about 10k coal and be able to bank it all.

then coal trucks are nice, especially if you have completed the seers diary. you could also do the mining guild but i tend to shy away from there.

how do the coal trucks work exactly, how much can i fit in the trucks

there are 18 coal rocks next to a cart west of McGrubbers woods that you can fill with coal and retrieve from another cart that is closer to the seers bank. Origionally you can have 120 coal per load but if you finish parts 1 2 and 3 of the seers diary you can hold 140, 168, and 196 per cart full, respectively.