Glass:  It's been my experience that some converters believe the rubber around the windshield and side windows is a complete seal in itself--that if a glass is removed and replaced it won't leak.  That is NOT true.  Butyl sealer is required between the glass and the rubber gasket.  It must be pumped in between the two, to the manufacturer's specifications.  In heavy rain (30 minutes into it), inspect the inside bottom of the glass at the rubber to see if there is any sign of water.  It should be dry.  Obviously, each side should be checked individually based on the direction of the weather.

Roof: The converter puts several holes in the roof-skin of your coach.  Those openings were sealed when new, but years of sun and weather deteriorate the sealant and leaks could develop. You may not know if it's leaking over and behind panels.  Have your roof inspected and resealed as necessary whenever you visit the service department.  It's not a big job and can prevent serious damage later.  

Tires:  Wash your tires, too!  They get more dirt and grime than the rest of the vehicle.  Keeping them clean will prolong their life.  Never use dishwashing detergent on them or anywhere else on any vehicle.  It damages oil based items by drying them out.   Be careful of what you put on your tires.  Some dressings actually damage the rubber.  Check with the tire manufacturer for approved products.

Drip marks: down the side of your stainless steel from rain?  Isopropyl alcohol wipes them away.  I use a white terrycloth towel moistened with the alcohol.  No steak-easy clean!

Ants and Roaches:  When parked in a susceptible area (Florida for instance), I spread fire-ant granules under the coach.  It's inexpensive, comes in a big bag that doesn't weigh much, and keeps all the non-airborne insects away. It works on grass or concrete.