Regret I can't claim the Vat back. The one I'm looking at is a Highline fully loaded with options (twin elec sliders, electric tailgate, heated seats, adaptive cruise, roof spoiler, comfort dash, chrome side bars, extra window tints and much more) and 6 months old. Can't find a T30 offering the same so figuring that the high spec offsets having the T32.Only get a T32 if you need to get your Vat back. No other reason to subject yourself to the suspension that I can see.
We've yet to have ours MoT'd of course, but my understanding is that as it's a "motorhome" on the V5 (!!) then we don't take it to a Class 7 MoT station.
When you say day van what's the kit out? My T28 is a camper and with unit and bed and elevating roof I had a saggy arse. T32 springs sorted that out. Units aren't light even in Vohringer ply and and seats are seriously heavy. Doing it again I would got for a T32. My last T5 was a T32. If you are just running as a van with seats then T30 should do, but if you later want to fully convert then a T32 would be a more attractive option IMO.