Am looking at low roof either 118WB or 136WB. Was wonderin' how well your dash ac does to keep your van (118wb/LR or 136wb/LR) cool in the cabin area and in the rest of the van when travelin'. Was thinkin' it might be better in the shorter van. Will be fully insulating. Sliding door window and rear door windows and driver and passenger doors with Expel tinting. Perhaps heavy curtain across the van just behind the seats. Just doin' some figgerin'. Would appreciate your experience with this. Thanks.