They weigh 48lbs apiece..... I put one in each hand and go where I need to go with them. Don't over complicate things.... I don't winterize mine. I run them once a month for a couple hours and keep Stabil in the tanks.
As far as security goes. When I'm at a campsite they are chained in my truck until I need them and then they are chained to the bumper of the camper with 7/16" Pewag square link security chain, and a matching lock that weighs a little over 2lbs by itself. I think the chain weighs just short of 30lbs in a 6 ft length.