For independant, unbiased information, go to:
RV Consumer Report, the "Green book of RV Ratings Guide"
My local library has a copy and they provide valuable information on quality of construction, value, and other good stuff.
I also looked at the 6 pack stuff before I bought a small (19 ft) Nash 5th wheel.
I liked the 6 pack line because it was quite light, something important because my 95 2500 4whd has a very low weight capacity.
I think the 6 pack has good ratings, but check them out.
Rog