AH - different country
My link was just a google search for
"1999 Monaco Executive, 40' non slide, non tag, M11, Roadmaster"
to see what other links might have re your weights...
'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk, 11 MVP Destiny, Open Range TT, popups, vans, tents...