These are the ones that we use for work -- there is a company named Kerberos International that makes these. The great thig is that it has 2 panels on each side and then 2 panels on top ... also auto tracking -- and they use LiFePO4 batteries for everything. I think that you can go to www.nexgensolartrailers.com also and see the skidmounted version that can also be mounted on a trailer. We have had them build us this small one like is in the picture all the way up to a 40' foot one that had (20) 455W solar panels, enough LiFePO4 to run a small city and a small diesel generator for backup. Allot of the time we will lend those trailers to the RED CROSS or counties going through an emergency or something ... its hard to see but in the front of the trailer there is a 30 foot mast that our environmental guys put a 250,000 dollar camera on to look for any type of leaking or fumes and can cover about 5 miles in any direction .... you can imagine how many of these things we have ... The tires are specially made for us - they are military KEVLAR run flats - i won't even tell you what one costs .... but for most part a good Load Range C fits this trailer just fine