The original DL's, and XL's without wheelchair lifts were just adequate for the most part, if carefully packed, when college students returned or headed to school. When the lifts were mandated, it sometimes became necessary to leave seats empty, as the cargo bays filled up before the seats did. This could have been prevented, if the carrier's strictly enforced the tariff limits on baggage and what should have been carried as 'express'. However, we are usually very liberal with our allowance, to gain good customer will, and also because for much of the time, our cargo bays are barely used, especially when on 'commuter' runs. It all sort of balances out.
As for good line coaches....for all their other faults, the 'J's' have good room, due to their height, as well as the rear location of the lift. the 'J' also has a very useful overhead compartment. Similarly the Van Hool's do well, due to their rear lift location. Neither of those two lifts encroach baggage space. The H3 does well, due to its tall height. The H3 makes a pretty good long haul line coach, although perhaps not as suitable for a commuter line coach account the extra steps to floor level....