An LS400 like that is irreplaceable. Just keep putting money into it, definitely worth it. Also keep an eye out for a well cared for example that’s for sale, sometimes you can get lucky. Never hurts to have a spare LOL.
Ours was a 1 ton window van (were all the Maxiwagons window vans?) with a full TEC (Travel Equipment Corporation) camper conversion with a kitchen in the back, a dinette that converted to forward facing benches or a bed and a pop top. My parents slept in the dinette bed and my sister and I slept up in an aluminum framed, canvas, hammock style bed that attached at the roof line inside the pop top.
I've searched for pictures or info on the TEC conversions and there isn't much out there and I haven't found anything online that looks like ours.