I have a roof rack on my car and I can carry 2 at a time. We are a few yards from the river so I bought some wheels to carry them over. I can sit comfortably for about 2 hours. I have a bad back though. I went to an Outfitter store that specializes in kayaks and wanted one I could carry with one hand. The ones from Costco and places like that re tippy. Mine are about 30" wide and very stable on the water.
ABN Universal Kayak Carrier - Trolley for Carrying Kayaks, Canoes, Paddleboar... https://www.amazon.com/dp/B01KETV7PS/ref=cm_sw_r_tw_dp_U_x_-B.UAbZZ19TG1