Roof seal at caps, especially the 4 corners.
Inspect all sealant on roof. No cracks.
Lightly press on lav skylight. If really yellow and flexible, might need replacement.
Bright work light to inspect interior.
Cabinets are subject to damage and water swelling below the sinks and the fridge. The paperboard under the cabinet faxing swells badly when it gets wet. Look under both sinks.
Unscrew the cap below the shower and take a look
Remove all bedding from over cab. Use light to inspect for water damage (in case of clearance light leaks). Inspect around the over cab windows
Bring ladder.
Inspect slide seals both extended and retracted .
Inspect bed slide topper extended and retracted.
Inspect awning extended and retracted. (Retracted can show sun damage on the exposed part.)
Inspect dash area for Gatorade (oops, that was me in mine, never mind).
If possible, fill grey and black tanks at start, let sit, and drain at end. Inspect for leaks under unit (plenty of room to lay underneath). Don't be alarmed by surface rust. They sit in weather as bare frame before being built.
In the left rear storage, inspect power cable for wear/damage.
Tires, assume replacement so you know what you have. Do look at them for strange wear. Fronts may have wear on outside, which can be normal. The unit is very light for the e450, and does not have enough weight in front for the stock camber.
Test ride. Unless work was done, it will ride very rough unloaded, do not be alarmed. Loaded, it is not bad stock, and can be very good with mods. Stock, and unloaded, it will wander, requiring almost constant steering input. Stock but loaded is doable, mods to the alignment make it suv like. Shocks and heavier sway bars make it even better, one or no hand at times.
I could go on...
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