You should be fine.
I have a 4500 lb tow limit also, I figure loaded im at apx 4,000 lbs .My suspention is a little more heavy duty.I only have a inline 5 cyl 3.5 220 HP
To tow 4500 lbs with the pilot(my parents towed with a 2006 4x4) you MUST add a trans cooler and power steering cooler, check your owners manuel.
2007 Fun Finder 189fbs Scrapped 4/16
2006 Hummer H3 1983 Honda CX650C
1968 Oldsmobile 442
2017 Keystone Summerland 1750RD