First off remove everything that is possible to remove. This greatly reduces cutting and fitting. Second choose a system that folds together easily. Some systems require hammering to connect. Third start on the center line of the trailer and work to each side. When replacing the cabinets over drill clearance holes in the flooring for the hold down screws and don't jam them down. In 10 years there is no evidence of any movement.
I used Armstrong flooring. Great assembly system. Hire a good assistant.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles