Duosida EV Chargers have proven to be very reliable at also very reasonable prices. This one is adjustable for use as a level 1 (120V) charger, or charging at level 2 (240V) can be set for several different amperages to work with almost any 240V circuit. Would need adapters for anything other that NEMA 14-50.

https://www.amazon.com/LECTRON-Electric-Vehicle-Charger-Extension/dp/B07HKLCXPJ/ref=sr_1_3?crid=2Z8F0YHM50IGA&dchild=1&keywords=lectron+32+amp+ev+charger&qid=1603463942&sprefix=lectron+32%2Cautomotive%2C166&sr=8-3

This one is a good choice if you feel that 16amps 240V is sufficient (on Nissan Leaf this is the 3kw level)

https://www.amazon.com/LECTRON-Level-Charger-Extension-J1772/dp/B079NTXNK7/ref=sr_1_14?crid=3M11U2VC6RNLD&dchild=1&keywords=evse+level+2+charger&qid=1603464625&sprefix=evse%2Caps%2C177&sr=8-14

I have been using Duosida chargers for 6 years with no reliability issues.

I have this one https://www.amazon.com/dp/B07HKLCXPJ/ref=cm_sw_r_apan_i_6A01P27RVETW3R5MEG56?_encoding=UTF8&psc=1

With this adapter coming in https://www.amazon.com/dp/B07XNSXWM4/ref=cm_sw_r_apan_i_4H5RQBKT5DXVZPT1K9PQ

We're planning to stay at the fernwood campground and they confirmed that's the plug they use, but they also have standard 110v outlets if needed. I'm planning to change the max current in vehicle to 16a or 13a just to be safe with a 110v. I'm still looking for a decently priced 5-15 plug to 14-50 receiver as I ran into the exact problem you mentioned.