Last I looked in CA (last year) you need a commercial class A license with medical certificate etc. to tow double.
I assume you need equivalent license from NV.
I believe your equipment would be legal on most roads but certainly restricted on some due to curves.
The tank is abs plastic. The plasti-mend will work great from the reviews I am reading. I'll try that out and see.Plastimend will make a permanent fix. Have used it and give it top rating.
However I would be tempted to just make a disk and silicone/screw to the tank side similar to the way the tornado is mounted. You can go plastimend later if it leaks.
Should find plenty of places to plug in. Lots of miles will charge the battery fairly well and with a decent battery you should make two nights easy without recharge.
Otherwise my Kipor ran fine before solar when I used to actually bring it.
I recommend Go Power inverters. 900w of heat for a few hours is going to need 6 to 8 batteries. Then how will you recharge?
I will suggest one of the propane catalytic heaters designed for indoor use if you need warmth.
I have the same 205-15 and steel wheels on my trailer. I moved up to D and 65 psi last go around and all has been fine four years now. Although the Denmans only lasted 3.5 years. Hopefully the new MAXXIS last longer.
Never read a post of a steel wheel failure from going an extra 15 psi.