The trucks you mentioned are quite possibly too heavy for your rig to tow and I would be looking for something smaller. You need to learn the some numbers for your rig before you can decide. The numbers are the the GVW (Gross Vehicle Weight), GCWR (Gross Combined Weight Rating), and the hitch rating. The GCWR is provided by the manufacturer and likely can be found with an Internet search if a local dealer cannot tell you what it is. The GVW is obtained by weighing the RV, loaded as it would be when driving on a trip. The hitch rating is provided by the hitch manufacturer and is usually included in the RV owners manual, if you have it. It is probably no more than 4000 pounds and may even be 3500 or less. There is an RV Glossary in our library that will help explain some of these terms. Click the Library button above, then click Newcomers need to know and select Glossary of terms.
The maximum weight SUV you can tow is the GCWR minus the GVW but in no case more than the hitch rating.
Some vehicles can be towed with all four wheels on the ground without modifications, while others require changes or cannot be towed at all. The Nissan, for example, requires the addition of a driveline disconnect. You can view a list of easily towable vehicles on the Motorhome magazine website - see Dinghy Towing there. Other vehicles require modifications, usually either a driveline disconnect or a transmission lube pump, both available from Remco for many brands of vehicles. REMCO is 1 800 228 2481 or at http://www.remcotowing.com/
[edit]Added pointer to Library.[/edit]
[edit] Corrected typo and syntax error.[/edit]