How often will you use? Will your hauls be mostly open roads or hilly? Is your F250 outfitted with tow package or a brake controller? You think you'll only use for your car?
An F250 gas be ok if you keep trailer light. My son has a 2001 F250 diesel and towing an open trailer from NH to Carlisle PA up hills, hardly know there is a trailer behind you.
I too was worried about total towing weight when I have to tow with my 2009 F150 with the factory towing package. With the 5.4 it's rated to tow ~ 11k.
I own two trailers, one is a WELLS Cargo 20' enclosed, arguably one of the better made trailers. I orig bought it to store and transport my 67 vert back and forth to body shop when it was being restored. Now car done, seldom used, I store my car in it during winters (so wife gets garage), NO mice can get in it.
Because most my general towing was gonna either to and from big shows or helping a friend, I wanted a lighter open trailer w/o paying to much. I bought an ANDERSON 18' open deck center trailer. Similar to "69GT350H".
It's well made, several cross braces across the center, beaver tail rear deck, slide out ramps (don't like flip up ramps), electric brake both axles (not all trailers do both axles) a spare tire that is locked in place, the hitch can be adjusted for different heights. My open trailer weighs ~ 1,800, my enclosed weighs ~ 3,200 empty.
To your question "how to keep car secure on trailer" if using open trailer when traveling? Best you always park it in plain view if possible under a light. Also You can put a good car cover over it that you can use a cable with lock underneath. When my friends and I go to Carlisle Ford Nationals and park at hotel, we cover our cars, they're fine. To help secure both my trailers in addition to hitch locks, I use heavy chains between two wheels and locks.
Note: I also like open deck because when I've needed to do either cleaning underneath car or some maintenance under it, drive car onto trailer.
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George email: <[email protected]