Jack the front bath and the two propane tanks are most probable why your tongue weight is higher than what mine weighs in at when its loaded up.
Think you will find you can get by without the second propane tank. I tend to alternate between dry camping
and power sites when on the road - normally try and stay in one spot at least 3-4 days at a time and have done a number of trips of 4 weeks or more and even though I run the fridge
on propane when dry camping
and use the furnace
as needed and do at least some of my cooking on the stove inside & do use the hot water tank for showers etc, I can get by for the 4 weeks without having to refill the one propane tank I have often gone longer. Obviously if you are having to use the furnace
a lot or leave the hot water tank on all the time your mileage may vary.
is not mounted permanently but my controller is so its a simple plug in to get it up and running. I camp a lot on the wet coast where big trees and lack of sunlight can be a problem - nice to be able to just move the panel to what sun I can find on the camping site and not have to move the trailer to the sun. I have used it in the south a fair bit as well both in State parks and the desert and if I stick it up on the roof its pretty hard to see and so far no one has helped themselves to it. I am going to attend a music festival this summer where I am told that people helping themselves to loose items can be an issue so I am starting to look at perhaps adding something to it so it can be locked to the trailer in some way making it a little harder for it to go for a walk.
Mine is an older panel and purchased back in the day when they were a lot more pricey than they are now. Its only 35w but as I have LED lights
and the only things using battery power are my water pump and Fantastic Fan and the occasional recharging of my laptop, camera batteries and light
use of the furnace
(thats a big drain). If the battery is in good condition I can go for 3 days or more without plugging in and the panel when in full sun will usually top it back up in just a few hours - limited sun of course takes a lot longer. If I was purchasing a new panel today (and I am looking at upgrading soon) I would look for something 90w or more and that would be more than enough for my needs and the same size as what I have now, might even let me watch a few movies. If you are wanting to run a TV and or a micro wave etc then obviously your power needs will be much greater than mine and in which case bigger is better ;-)
Enjoy your new trailer and safe travels!