Bucket of water for your feet, ice cold beer / wine ( delete as appropriate).
Shower B4 bed , leaving hair damp, crack every window
go to be late in cooler conditions. Sleep down stairs with the pop top fully up (headliner) if poss (presume only two of you as only two chairs)
create some shade for the van to reduce full sun (Big picnic blanket in photo, drape it over the van)
mist spray water to cool off (damp sheet cover work wonders )
Raise and lower the roof b4 bed to change the air.
Enjoy you lucky camper
great looking T4