If I carry something in the MH, I try to make it multi use. i.e. I carry a small assortment of 2x8 wood. I can use these under the tires for leveling, under a hydraulic jack if I need to change a tire. and if worst comes to worst, I can throw them on the camp fire.
2001 Coachmen Mirada (Ford F53 6.8L V10) - Toad 2001 Civic
It won't do MACH 2, but I can get a sandwich and take a pee.