You are supposed to de-winterize in the lake. Just push it off the trailer, and then see if it starts as you drift into deep enough water to fully trim down.
Let me be the first to congratulate you son the new boat and welcome you here. Next step, post pictures of the boat!
https://www.searay.com/us/en/owners.html Scroll to the bottom and go to owners resources. You should be able to find manuals, spec sheets, and other information for your boat.
My concern isn't the storage as much as the movement on and off. Stupid forklift operators for example. HVAC units sit on TPO roofs all the time. But you can build a good sized metal storage building for the price of replacing a roof when someone screws up the placement.
Another factor to consider is height. Type of trailer matters, as aluminum bunk trailers are taller than steel trailers with drop axles. Mine is almost 10' to the top of the windshield. Add a Tower, and the top is over 11' even folded forward.
A Frenchman, Englishman and an Australian go exploring in the jungle.
After some time, they come across a beautiful lake and all decide to go swimming.
Afterwards as they leave the crystal-clear water they are captured by a local tribe and are brought before the chief.
The chief looks at them...
The woman says: "Doctor, I don't know what to do. Every day my husband seems to lose his temper for no reason.
It scares me."
The Doctor says: "I have a cure for that. When it seems that your husband is getting angry, just take a glass of water and start swishing it in your mouth. Just swish...