Get a bottle jack and piece of 90 degree angle iron. Place the angle iron under the sleeper, push against that with the bottle jack. Once you remove the air lines and the retainers, unscrew the airbags counterclockwise, and they should come right out.
Assuming you're referring to a Volvo VNL 780 truck, with the double bunk sleeper, 12'6".
You'd have to contact Volvo customer service for this. IIRC, there were a couple different options for the 730 and 780.
with a fridge
96 inches.
Try seaking seal
Volvo dealership. Have fun with that... if you've never taken off a Volvo starter, you could be in for a lot of excitement.
16"
15,000 to 18,000 lbs., depending on options.
You do not need any special tools to change out the auxiliary fan switch on a 1989 Volvo 780. The wrenches you normally use are sufficient.
On the right side of the throttle pedal
Curb weight for a 780 is typically between 18,000 - 19,000 lbs.
Please go to this URL. I think 780 has the same relays and locations: http://www.davebarton.com/pdf/relay_87_700.pdf Igor.