Actually Mark worked for Alpha Leisure who already was building Toyhaulers prior to opening up WW.I purchased my Alpha Toyhouse in 1989 after taking a tour of Marks facility that he had just opened. He had some nice upgrades compared to the Toyhouse ...
You should be able to install this system.https://www.amazon.com/gp/product/B00JK12544/ref=oh_aui_search_detailpage?ie=UTF8&psc=1I have 400 Watts in panels and a 30 Amp Controller. Works Great and easy install.
Your trailer probably came with Load range D Tires which max inflation would be 65 PSI.Make sure the rims are rated for the E rated tires.Rating should be stamped on the inside of the rim.