Camping became very popular after they got rid of school on Saturdays.
There are a surprising amount of trailers in Korea, however they are also very expensive here. (2~3X American price!) Only people who are well off can afford them. There are some TTs and HTTs, but the roads and campgrounds make it difficult to get into them with a bigger trailer. There are a lot of tents because they are affordable. We have six! And 18 sleeping bags, and ... LOL
We went to the Formula 1 race this year, and I saw a LOT of really expensive TTs, but then again, they are the extreme of the economic spectrum here. This TV costs over $300K here! The trailer is ~ $100K
Our trailer is the biggest that can easily get into an average Korean campground, as most campgrounds here have natural tree growth.
There are some "planned" campgrounds, but they are boring! Americans would consider most campgrounds here as "boondocking" with a water supply and dirty bathrooms. But we also can let our dog run around and play. After reading about all the rules in the states, I like camping here a LOT more.
We imported our new trailer ourselves. A pain, but with the Korea/US Free Trade Agreement, we only paid a little more than we would have in America.
We love winter camping! Our record is -13C! It's actually warmer in our big green tent than in the popup! We used to be no electricity, so we have a boiler system for the sleeping area, and a big kerosene heater for the inner area of our tent. When it was -12C outside, it was 22C inside our tent! We now use the tent as a meeting/eating area in winter for all our friends. Our maiden voyage is this weekend, and it's going to be -3C or colder. Yippee!!!