The thing about new offers is ..they all look wonderful, and the bulk of recuiters out there will tell you Anything to make your company look below par of theirs.
Regulation states that the A/C is operable in Any truck..and these days a whole lot of folks won't comply with the "green" thing, placing the emission updates so we can travel into lovely California, or sending money on the new antifreeze mixture..alot of them figure it isn't worth it and they find other freight to haul. I sit in an industrial area four to nine hours a day with no A/C, and the job I have is one that came along after four months of unemployment. For me in my search, what I have now equates after taxes to nothing more than MINIMUM WAGE, and in my area there Is nothing better that's available. From what I hear, starters for alot of places now are bottom of the barrel..and a job at all is better than no job or being at the bottom of the pole.
Drink more fluids, add vitamins, take care of yourself, and don't let the smoke screen of the other company blind you. Follow the advise of carniflex if you feel you need more seniority...but stay where you are. If this new company lets you in and takes a drop in clientele, you'll screw yourself.