Any trailer that is wired for 50 amp service can also be used with 30 amp. The only restiction I have found is you can not run two A/C's at one time while using 30 amp.
All of our prior rigs have had 6-8 gallon water heaters, which are adequate. However the ten gallon is very nice for taking a shower while DW is also doing dishes. Trace
JohnD, Are you saying that the H/W heater in your TT only ran on LP/Gas? My 2012 North Trail had gas or electric or both. My 2011 Edge also had both gas and electric. I don't recall owning any RV that did not have both. Even my German Caravan I had in Germany had both (electric was 230V).