mercedes..my latest project(1 of many)

basically you cut the chassis & add the required length of new chassis+weld & reinforce etc..i could do it myself but im always short of time..the best price i can get around newcastle (recar)is approx $4500 to add 1metre to the chassis(for every metre/3.3ft you should get a bit over 4ft legal total length .. to lenghten a prime mover mite be a bit pricey..i guess it depends on how long you need to go