We have more than 100 years of zeppelins under humanity belt. We made quite a technology leap with materials. Yet there are no smallish ones filled with hydrogen. And hydrogen is so easy to get that we have car engines producing it in cars that use hydrogen.
EDIT - why use Hydrogen and not helium. Helium is produced from natural gas. So in a plant that need to bottle it up and ship. Kind like fuel but you can drive on one gallon of fuel while you cannot fly with only one gallon of helium. You need to fill blimp to the brim. So no folding-up, either it need to stay blowed or you need to park next to station. Hydrogen can be made from glass of water. You know, the stuff that fall from sky. Taken that whole world helium production would suffice for 6 millions "uses" of lorry size blimp, ignoring other needs for helium, It's quite small compared to other means of transportation. Also helium have around 8% smaller buoyant lift.
Now for the math:
Cubic size of lorry - 30,10 m^3 (Vauxhall/Opel Monavo).
Gross buoyant lift of hydrogen 1,1399 kg/m^3
That give you 34 kilograms of lift. Even when you neglect the weight of blimp itself (assume the material and engine as 0) all you could carry is small child.
Great for late term abortion, not so good for traveling.
Also the size of the lorry is the size of the lorry. That equal 3 regular city cars. Equip those three cars with same hydrogen plants and you have very cheap means of travel that don't go sideways when wind blows.
I just had a vision of tragic yet hilarious balloons that go up in the air and bop each other in the air. Like a slow motion pinball.
Also for hot air balloon requirement for the balloon to take of are
In brief, the perfect weather conditions our hot air balloons need to
fly are: ◾Dry ◾Good visibility ◾Light winds of less than 10-12 miles
Now TA in radio are "the roads are slippery, be careful". With blimps, it would be "the wind is 15 mph so stay home and don't travel"
Extra science. From this paper about fuel economy hydrogen engines take around 70 miles per gallon. From this conversion table one m^3 of hydrogen is 2,9 gallons. So what would you take 30 m^3 just to have the blimp would equal 2100 miles/3380 kilometres on the road. So a trip from New York to Chicago through Columbus and Indianapolis and back.
Or Chicago - Denver twice if you want that countryside transport.
So to quote some old guy from 1880 about flying balloons shaped like cigars:
It will never stick. Carriages without horses are the future.