Quad bunks are hard to fine these days.
You should consider new. Not sure the budget...
If that trailer is clean and no leaks go for it. Not sure the pricetag.
Jayco makes the x213 with two front bunks. You can put someone on the jack knife sofa or dinette.
https://www.jayco.com/products/travel-trailers/2018-jay-feather/x213/They used to make a x254. These are the newest type you can find and it may be beneficial to get newer then a 2005..
2016 was last year of x254 quad bunk.
https://www.youtube.com/watch?v=SOIZYJhqM3gtongue weights were about 400-450lbs
The x254's had a U dinette and they did away with the couach... A nice feature IMO.