Hi folks! Just got a Promaster that came converted. It is a 136wb with fixed sliding door window and fixed cargo door windows. It was a Maxxair fan over the bed in the rear. I got sun shades for all the windows, but even with the front windows cracked, the shades on, and the fan blowing it still gets pretty hot in the van. I used to have a Northstar TC650 pup up truck camper in my truck and it was super well ventilated with a single van and stayed cool, even on the hottest desert camping days. My assumption would be that I need to add windows that open and/or add another roof fan? I did just order these Overland Screens Airvents | Sprinter, ProMaster, and Transit Vans as I heard this makes a pretty big difference in keeping the van cool (with the fan running). We will likely leave our two mini schnauzers for up to 4-5 hours at a time. Normally its at a unpaved trail head, but sometimes in the woods and sometimes not. What are some of the best ways to keep these dudes comfy and cool? Thanks!