1963 Traveleze questions

I have inherited a original 21' single axle Traveleze that was bought new by a family member. I presently live full time in it and I need to move it for the first time since 1977. No exterior lights work and no power to them-I checked with a DVOM. No idea how to find a wiring diagram and the trailer will not be used for traveling so I bought some magnetic led trailer lights that work very well. new tires are not a problem of course but the rims are the old split rim design and I need new rims to support the weight of this travel trailer. I have no idea how heavy it is but I figure approaching 6,000 lbs dry. Anyone knows for certain feel free to say so. I am staying away from off shore rims.

I did run across US made rims from Dexstar

 shop.redneck-trailer.com/p-759-dexstar-15-x-6-oem-wheel-655-wh156-60e.aspx

That are my size but not sure if safe at their rating. Anyone using these rims?

Also, I do not have a class 3 hitch set up for load levelers-on my full size 4wd Chevy truck that is air bagged. Any opinion as to how safe or dumb it would be to tow this setup say 30 miles? I do have a after market rear bumper with a bolt on drop hitch I have used to pull a loaded 16' stock trailer with horses and it pulls fine in all respects, although it is a twin axle unlike the Traveleze which is a single axle. Any ideas or comments are welcome