Back again, no diesel if used inside a building.  If hauling on a trailer, make sure it is heavy, 16" stringers
minimum, big axles.  Some use 3/4" plywood on the floor to spread the weight.  These things are heavy,
a 5,000 lb forklift will weigh at least 10K, and the 4 smaller tires concentrate the load.
And yes they can get stuck outside, nature of the beast.  Common sense prevails.