I apologize! My response to your question was measured, but not enough. When filled, that tank weighs in at 500 lbs, or 1/4 ton. My latest creation weighs in at roughly 900 lbs. That's your 3/4 ton capacity.
Yes that's a harbor freight trailer.
There is a famous YouTuber named Bob wells. His channel is cheap rv living.
One of his videos he talks about the scale of life. Yes I think many times he could wear the hat of a philosopher. No matter his scale measures comfort vs. Freedom. That little camper is a reflection of what he talks about in that video. I am calling it my travel trailer. Other than things I had laying around, I have less money tied up there than what I figured the difference in gasoline for the trip I plan to be. That is the Freedom factor!!! And though it has bathroom facilities, refrigerator, A/C, heated bed, comfortable seating, and Stand up room for getting dressed. It has very little comfort. A true tail gator at best!!!
I find it hard to believe an 11ft cab over camper could weigh in at less that that little trailer. For that matter at twice the weight. Forgetting 500 lbs in fuel, twice the weight would exceed the capacity of a 3/4 ton truck, I don't care who makes it, or the drive train it has.
On another note is center of gravity, something that cabovers present.
Anyhow it looks like you are rethinking your direction!
Welcome to the forum, people here won't lead you astray!