Low floor trams don't mean anything if there is nowhere to get on or off though, they are mostly useless on the 19, 48 and 109 outside the CBD due to the nonexistence of accessible stops along the majority of routes once you leave the Free Tram Zone, Melbourne Uni, St Kilda Rd or Victoria St - the only exceptions are the 96 and 109 on the light rail side, where both routes are accessible from the city all the way to the end. I don't know the northern side of the city so I will not comment about those routes. The 19 in particular takes the cake for not even having one outside Flinders Street Station.
The 5 has a couple on Dandenong Rd, which are mostly useless because Malvern just loves putting Z3s on this route to compliment Glenhuntly's selection of high floor trams on the same road (route 64).
The 6 has just one at the Glen Iris terminus, so of course it makes sense that the 6 gets the odd D2 now and then. The 5, 16 and 72 don't even have such a stop at their outer termini so if a wheelchair was still on they would be stuck on the tram all the way back towards the city. The only other Malvern route which has an "accessible" outer terminus is the 58 (except that about 80% of the trams on the 58 are B2s and Z3s).
The 16's token stops are Balaclava station and stop 48 Dandenong Rd (what was even the point of that one, for wheelchairs to cross two major roads and meet the Glenhuntly B2s?)
The 19 has one at the North Coburg terminus and not much else.
The 48 has a few along Bridge Rd (useless for the high-floor-only 75) and then one more at the North Balwyn terminus, not even bothering with a platform stop where the 109 meets up at Kew, despite having ample room for one outside QPO where the routes split.
The 58 has one at the Toorak terminus, the next one inbound is near the Metro Tunnel work site at the other end of Toorak Rd, and was only done because the old (and non-upgraded) route 8 section via Park St/Domain Rd was cut off. Naturally no connecting stop was built for the nearby 16 thus making the 58's platform stop completely useless aside from a long push to the Glen Waverley train. Of course there isn't an accessible stop outside South Yarra, instead they decided to build one outside Richmond on the 70 instead which is run with A class trams (and the odd B2 now and then).
The 72 has its token stop at Gardiner station, and the platform stop was only built due to the grade separation project. It only makes sense that just like the busy South Yarra and Glenferrie stations, Camberwell also misses out.
The 109 has no accessible stops at all between Victoria Gardens (stop 25) and Mont Albert (stop 54). Which of course means no accessible connections with the low floor trams on the 16, 48 or 72 as stated above.