TM   10-4610-241-24 TO  40W4-13-42 1-9.  EQUIPMENT  CHARACTERISTICS,  CAPABILITIES,  AND  FEATURES. For  information  on  equipment  characteristics,  capabilities,  and  features  of  the  equipment  covered  in  this  manual,  refer  to  TM 10-4610-241-10;  TM  08580D-10/l;  T.O.  40W4-31-41 l-10.  LOCATION  AND  DESCRIPTION  OF  MAJOR  COMPONENTS. For  information  on  the  location  and  description  of  the  major  components,  refer  to  TM  10-4610-241-10;  T.O.  40W4-13-41. 1-11.   DIFFERENCES   BETWEEN   MODELS. There are six models of the ROWPU covered in this manual. These model are designated as follows: Army  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Model WPES- 10 and Model H-9518-1 Air Force . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . Model  WPES-20  and  Model  H-9518-2 Navy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Model  WPES-30  and  Model  H-9518-3 Major differences between the three models are listed below and are described in subsequent paragraphs. Maintenance procedures  appearing  in  this  manual  that  are  applicable  to  only  specific  models  of  the  ROWPU  are  identified  with  the designation  (Model  WPES-10,  Model  H-9518-1,  Model  WPES-20,  H-9518-2,  Model  WPES-30  or  H-9518-3)  in  the paragraph heading or procedural step. Procedures applicable to all six models do not contain any designation. DIFFERENCES  BETWEEN  MODELS WPES-10 WPES-20 WPES-30 and and and H-9518-1 H-9518-2 H-9518-3 USER ARMY AIR FORCE NAVY EQUIPMENT Flatbed cargo trailer X 30KW  Generator  set X Two  forklift  pockets  in  frame X Four  forklift  pockets  in  frame X Single power input X X Dual  power  input X Front  removal  of  R.O.  elements X Front/rear  removal  of  R.O.  elements X X Power  cable  supplied X Change   1   1-3