The Tridako HC5128 and a smaller prototype are made for truckers with limited frame rail space. The larger unit is 28 inches wide and offers 24,000 Btus of air conditioning capacity, 30,000 Btus of cab heat, 6,000 watts of 120-volt, 60-Hertz AC power and 60 amps of 12-volt DC power. The smaller 24-in. width design removes the AC generator and includes a 150-amp DC alternator that can provide hotel loads with a power converter. Both units employ an 11.8-hp CAT two-cylinder diesel that runs at 2,800 rpm.