The connecting canopy section adds an extra 135cm on the side of the tent, and the tent part is 500cm across for the 5m and 400cm for the 4m. You have the guy ropes going out at 12 points and the dimensions of your van of course. So, for the 5m you need at least 7m plus the width of your van across the front, and 7m back, to fit it in comfortably, and a metre less for the 4m but it’s difficult to give an exact footprint because the guy ropes can be lengthened and shortened as desired so it’s adaptable if necessary.We also sell reducer poles so the guy lines can run even shorter! Find our reducer poles: here.You can view product specs for both size Glawnings here:4m/5m glawningLITE spec:Overall Weight:  36kg/43kgPacked Size(in delivery box):  115 x 34 x 34cmPitching Time:  10 minutesMinimum Pitch Size: 8 x 6 m/ 9 x 7mKador Length:  250cmCanvas:  200gsm, polycotton, waterproof, mildew resistant Groundsheet: black 420D Oxford fabric (waterproof, PU coating) Poles: aluminium Fire Compatible:YES (stove jack pre-installed with fireproof square & Velcro flap)