Friends have one of the little trailers with the Alde heat system. The Alde had a failure and was eventually diagnosed as a control board issue. No other comments from them about other issues.
The manufacturer, Little Guy or whatever they're called now has been marketing the small T@B and T@G teardrops for years and we were not impressed by the build quality of our T@B. I had dozens of issues with things not working or assembled incorrectly or just breaking due to poor design and execution. We sold it after 9 months at a substantial loss just to cut our losses. We found that their pricing was quite high based solely on the novelty and "cuteness" factor which was their main appeal. This is their first attempt at making a truck camper so I personally wouldn't be tempted.
I doubt ozone would take care of off gassing. Might help if windows were left open for a month after an ozone blast. Problem is the glues will contiune to off gas for a long time especially when the camper becomes hot inside from the summer heat. I had a travel trailer that off gas for the two years I owned it.Trailer would burn my eyes when I walked in it on a 75/80 degree day.
I looked at them recently at a truck camper sales place. Heavy off gassing smell inside of the two we tried to look at. Never notice that in lance, arctic fox, host and others.