This really depends on whether the switches and outlets are self-contained, or box mounted. Some manufacturers use boxes, some don't. If youve got the type without a box, then you will either have to buy the same type, or install a box to use standard outlets. Also - the cover plates are different. A self contained outlet or switch will use a snap on cover, as opposed to one that is secured with screws with standard outlets.
The self contained outlets have a "wing tab" on them which grips the backside of the sheetrock. You can purchase outlet boxes with the same kind of tab. The advantage to these, is that you do not have to mount the box to a stud... it holds itself in place by pinching the wall, therefore you have a little more freedom in placement.
Look at an existing switch.... if it has the mounting screws at top and bottom center, then you can use standard switches. BUT, if you see 2 screws at opposite corners of the switch...then youve got the wing tab type, or 'self contained'. Same goes for the outlets.
You can get new outlets and switches of this type at mobile home suppliers, or even through dealerships (they can order them from the manufacturer for you)
Oh, by the way.... the normal wire pattern for most mobile homes... the power lines are run around the walls, usually about the height of the outlets.. and then UP to switches and ceiling fixtures. Its not too uncommon to see a switch with a couple of wires coming in from underneath it, and another out the top. One of the wires coming up from underneath will be the power supply, the other will be a runner to an outlet. The one going out the top will goto a ceiling fixture.
One more item... the 'self contained' outlets and switches - with the wing tabs... have a removable back. Typically, the wire is run thru the front casing of the receptacle or switch, the wires are pressed into the proper slots, and the back is inserted. IF you switch to standard outlets.... you will need to cut some of these wires, in order to mount them to the side screws. ( I agree with another person who answered on here, don't use the push slots, Ive pulled too many outlets out of walls where the wire wasnt inserted properly, and either popped out, or was already out) So -- If you need to cut some of these wires.. make sure you have plenty of play in the wire where you cut it. A lot of manufacturers will anchor the wires in place with wire staples.
:) dont forget to shut off the power before working on any of these :)