I have to rebuild the top of my HiLo. I would like to update the Electrical components. Change the floor plan add heat/air add water tank new kitchen. I'VE rebuilt cars and I know original is the best seller. Would it be best vintage or upgraded. OH and I want to change the top half siding like the newer models.

I would say remodel to your tastes/use. A trailer that old isn't worth a lot of $. Condition counts when reselling. After you fix it all up you won't want to sell it.

Well thank you I will post pictures soon. I am going to research first how to separate the two halves first . I don't want to mess it up

This may help you. Cable replacement in my 1998 HiLo 24TD. 3-3-2010. The best advice would come from someone that has done this on a 60s model HiLo.