A neat , clean trailer plug . This is more or less how you want your to look ! should be removed periodically to check the state of the wiring – if the wires are corroded or are fraying at the connections , it ’ s time to pull the wires out and clean them up . Better still , buy a new replacement plug . It ’ s cheap insurance .
 The same applies to taillights and marker lights – if you ’ re not running LEDs , that is . Trailer lights can be inadequate in keeping out moisture , and so like the trailer plug , you need to periodically remove the lenses and see that the wire connectors and bulb holders have not become corroded .
 5 . HOT-WATER SERVICE
 A gas hot water service is usually very reliable but it ’ s worth the effort to have a close look at the tank for leaks where the element assembly seals to the tank body , or where the tank halves have been joined at the factory .
 Of course , the element itself failing is a possibility but ( provided that the hot water service has not been built-in too much within the layout ), it ’ s possible to have it replaced .
 Check where the awning material joins the roller to make sure that it hasn ’ t slipped out of the retaining groove . Provided that it has not torn , the retaining cord can be removed and the awning material inserted back into the retaining groove ( and the retaining cord refitted ).
 4 . WIRING ISSUES
 As a caravan ages – and even with not-so-old vans left out in the weather – broken or corroded wiring can occur , especially at the trailer plug .
 Because wiring plug housings are not fully sealed , moisture can get in . The plug cover
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