New guy with questions

[NOTHING ELSE MATTERS]

Hello everyone, my name is George and just join in this place, but i've been reading for a while. I have a very good chance of getting a 1986 V20 dual console. The boat(from pictures) looks great but i will go and see it tomorrow. A few questions though.
1-Is any place that i can go and get or see old manuals and specification books? I went to the Wellcraft site and i found something but not anything about the dual console.
2-What things i should check out? Transom is the first thing, but any other "known" common problems?
3-Is any flotation in these boats?
4-Are these boats self bailing?
5-Trailers; is it o.k to use roller trailer or have to use bunk trailer ?

Thanks in advance, George.