As long as you don't mind constantly stepping over/under the cord and charger whenever you're moving about inside the rig. I've done it. No contest between that way and Trik-L-Start, which once properly installed requires ZERO attention.
There's another option to the Trikl thing. Just plug your new rig into shore power and use a smart charger to run power from a live 120VAC outlet inside the rig, to the 12VDC (always live) outlet below the ash tray/cup holder up front, using the 12VDC cigar lighter plug that usually comes with portable battery chargers/maintainers.