Is that 7200 dry or GVWR for the 5th wheel trailer? I have been pulling my 7880 GVWR 5th wheel over every mountain I can find for the last 15 years with my old F150. No issues, none. Properly equipped I see no issue with a 150/1500 truck. Most on the lot are NOT properly equipped. You must look very closely at options and the door sticker to know you are getting the right equipment. The dealer/salesman does not care. Watch your payload rating. Many people are more comfortable in a larger truck and that is OK too. Since you are spending money it is not a huge leap to go 3/4 or 1T-SRW.