Here is what you have and what you can get if you stay with your current wheels:
205/75R14 LRC @ 50 PSI max 1760 pounds x 4 = 7040 max tire capacity
205/75R14 LRD @ 65 PSI max 2040 pounds x 4 = 8160 max tire capacity
So you can install load range D tires in the same size and increase your capacity by 1120 pounds.
WalMart has Carlisle Radial Trail HD tires in that size for $50 each. They are currently out of stock on the WalMart website, so when they are back in stock, they should be a relatively current manufacture date.
https://www.walmart.com/ip/Carlisle-...-D-8/189531797