If you keep the trailers GVWR (max loaded trailer weight) under your towing capacity, you should be OK.
You'll also need to watch you tongue weight which should fall between 10% to 15% of your loaded trailer weght. Subtract what your tow vehicle actually weighs from it's GVWR (usually found on the sticker located on the drivers side door jam) to see what your payload is. Subtract all the weight being loaded in the truck, gas, people, cargo, hitch itself and what is left will be your tongue weight capacity.
You'll also need to check your GCWR (loaded trailer plus loaded vehcle weight).
As far as pricing, shoot for less than 75% of the trailers MSRP.
Welcome to the forum and good luck. There will be others on here that can help as well. Don't be in too big of a hurry and consider everyone's advice.
Gary & Trish
"PT Crew Member Since 11/2010"
2017 Prime Time Crusader 315RST TE 6.0 : 2007 Flagstaff 206ST MAC Series
2012 F-250 Lariat : FX4 : CC : SB : 6.7L Diesel : 3/55 Gears
2016 Nights Camped - 9