If there is nothing to move, for example hallways of offices, hotels, etc I can "blaze" through those areas at a rate of 1,000 sf an hour. Doing them for 5¢ per sq foot equals $50 per hour. If your target labor rate is $40 per hour, $50 per 1,000 sf makes sense.
Once you add in more difficult spots, moving objects, perhaps your productivity drops to 750 sf per hour. You have to adjust price based on loss of productivity. Then again, with a truckmount and a 14" wand you might (better) see productivity rates in excess of 1500 sf per hour.
Now you have to figure in overhead, $10,000 truckmount at 8% for 60 months is $202.76 loan payments. Perhaps another $200 for fuel. Compare that to a $3,000 portable. If you are silly enough finance it for 5 years @ 8% your payments are only $60.83. Even if it takes 2 years to pay it off, were looking at only $135.68. Since you are using the client's electricity, your energy costs are nothing. With a portable, you pass those savings onto the customer. You also pass on the expense of limited productivity.
Without knowing your true total cost, plus your target earnings, there is no way to properly quote any job, and every job is different.