I recently installed a MaxxAir Deluxe 7000k fan on my 16' Scamp.

It's fairly easy for someone with the right tools (see my list below) but there are three important things to know:

1. The Maxxair fan does not fit in the existing hatch opening (too wide); another cutout must be made
2. The included attach flange is flat whereas the roof is curved; impossible to find an existing adaptor online
3. The roof is so thin that the fan will protrude inside the Scamp if mounted as-is

Here's how I addressed these problems. In order to prevent the fan to protrude inside, I created a wood spacer using rough wood strips from Home Depot arranged in a square and glued together. It gets tricky because you have to shape the bottom face of the spacer to make it curved. So the top of the spacer is flat to receive the fan base and the bottom of the spacer is curved to match the Scamp's roof. I did it using my jig saw (removing as much material as possible, giving it a rough curved shape) and finished with my orbital sander. Once you're happy with the shape, fill hole/defect with wood filler, apply two coats of protective finish and paint it. This way the wood will resist the weather and will not become a sponge right away.

Once the spacer is created, the rest is easy: measure/draw lines on the roof, apply tape to protect surface before cutting, cut with jig saw, stack two layers (or more) of butyl tape where the spacer will be, screw fan base on spacer using some more butyl tape, screw spacer + fan base to the trailer from inside using some other stainless steel screws (butyl tape is compressed and fills voids/gaps (if any), install fan on its base, temporary pull ceiling insulation so you can run wires to nearest 12v source (beware of the polarity!)... enjoy!

I tested it in harsh rain for several days, no leak! APPROVED. lol.

Things you need:

• Wood strips
• Wood glue
• Wood finish (for waterproofing)
• Paint
• Butyl tape
• Stainless Steel screws
• Electrical wires to connect to trailer system
• Sander
• Jig Saw
• Drill/Driver
• Silicone (if butyl tape is not enough to fill the gaps)
• Double-sided tape or cement glue to glue insulation back in place if you pulled to much