Can't tell which FR trailer you have, but here are the numbers for a Salem 2011 T26RKS. Might be typical for your TT. We have a 2011 22RKS and the specs are the same.
Just spent four days dry camping with no need to refill or dump during the stay at our camp spot at 10,500 in the Uinta Mountains.
Here is the unlikely web address if it helps: RV
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Number Of Fresh Water Holding Tanks 1
Total Fresh Water Tank Capacity (gal/l) 50 / 189.3
Number Of Gray Water Holding Tanks 1
Total Gray Water Tank Capacity (gal/l) 75 / 283.9
Number Of Black Water Holding Tanks 1
Total Black Water Tank Capacity (gal/l) 40 / 151.4